Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5f94a3c036517e…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 11:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 8cb71aaafe314c9ad248da491ef782ef SHA-1: 61897a068226f9effae155e63fc080b4ac50e014 SHA-256: bc5f94a3c036517eece41bf850325c2a4f48b76047462f9b349027ad23073fb0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or IP addresses, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://letstravelforacause.com/miet/assets/files/36375578960.pdf In PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/7741738368.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210901160526751269.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e192810ee---42241387438.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/92235762747.pdfIn PDF document text
    • http://capri.lt/userfiles/files/jiduvefadipusivagukoji.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/52426124798.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/50869385618.pdfIn PDF document text
    • http://c-amc.com/upload/files/negefejijesinemojizobu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1612eacc9cfa65---74151756608.pdfPDF link annotation
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/82546344020.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/tigikaxedax.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c627b53ed---kemawovedagezuzareboxu.pdfIn PDF document text
    • http://newworldss.com/uploads/file/58084962671.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/sinupa.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/ginegowaxav.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/43480265478.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/jegusisej.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/98325852045.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/a3d8d1687c3199e81510b4cc76b2b03c/papadijipexu.pdfIn PDF document text
    • http://kftchem.com/upload/files/32019681260.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137520b9be36---kolam.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/85103323750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=papa%27s+freezeria+to+go+download+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1B 10948 bytes
SHA-256: dbb3b4a80fcb8060aee68e20f1b904d67b6087c4bc2622e5c6c8a30c80946c9e
font_01_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 17580 bytes
SHA-256: 5c003f14790721887ffffd0d919f17c9a9deca0c5a7f14c32aeca331238bf00b
font_02_sfnt_off000124ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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