Malicious PDF — malware analysis report

Static analysis result for SHA-256 614588b8162f437a…

MALICIOUS

PDF

98.3 KB Created: 2021-07-20 12:00:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a95b4cfe34a67eb7933b75b174c28c6d SHA-1: 25c7343c41f22a4a11c74f052e8af98e80c69fe2 SHA-256: 614588b8162f437a04e19d73a0a1e4a2ba9b22fa2cb5bb201ecb7389afbf0810
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm pointing to potentially compromised or disposable hosting. The presence of embedded URLs, including one pointing to a raw IP address, suggests an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristics strongly imply a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9705

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://toshiteriyakiburien.com/uploads/files/40057702368.pdf In PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/eadcb8fa75fc28890c53f0dc273466ed/78825350922.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/42007176137.pdfIn PDF document text
    • https://kham.vn/userfiles/file/86242189743.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/cpmadusp2iv0r7gt027tqdddpc/88975187087.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/0d95a42903c1031292f729a850293b92/33364075144.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/mobata.pdfPDF link annotation
    • https://alnahamgroup.com/userfiles/file/norurit.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941dcd7f2b7---82501616532.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f841de06ea---38409379629.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/870806833.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c38aa653e70---lesikovodagelefaxenajadib.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/0d4177cae0d909db266c1faf1cabe776/redusani.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/depoxewilumadodazejudet.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/kekopufopaxonutevitevu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7eb54ef4c---98404925527.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de32e56b167---tunutiwedukemusomudi.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609786f56221f---rufibopa.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/jugetubawovugaxodifawog.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833f82ab73b---64039765722.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/15860041713.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/27704d5ce84858e76c46a12b875922b5/xugunibonoz.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3cc785c918d85a069050a626d4176439/5980529383.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/85634dcd2a858900ac1aab163d4ea9f6/67146390647.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f359532b64---25192322327.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/253f4abe3d262ff9e0c88a741cbb8463/lunipupigojap.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c7498355c---zigebubugapinolalukomenuk.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/45566356268.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=coming+from+you+that%27s+a+compliment+meaningPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 17200 bytes
SHA-256: f2ac7d451f0ed3e4ad25cd4cfd9030fd8739cca7035b6c0f0fda5d5a912e3136
font_01_sfnt_off00013091.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13091 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148A8 11204 bytes
SHA-256: 85d329f341253c0a759154e474458302930ed449ec693f787660446b607c94b8
font_03_sfnt_off000162d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D0 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae