Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d0157e357395a3…

MALICIOUS

PDF

98.1 KB Created: 2021-08-08 20:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3072214d15ef38347a33d131dc8aa0de SHA-1: 28a3b91ec3e85e67ec891eb9838b549a0841ef6e SHA-256: a1d0157e357395a31fe637147a68f234057434d6fb9c4ccead1145a8e5c00663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/uplcv?utm_term=what+is+two+sample+hypothesis+testing PDF link annotation
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/sj0apd5d62ovgchti0hvdrpp09/wudelawogibofe.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160aaba6b265ff---mawewusugerowaxuduw.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/pudapeforowugasapopokirag.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6420d9a2da4bec6d2e79c996d180a1e5/sibapiputuwinosesimuliki.pdfIn PDF document text
    • https://arerp.kr/data/file///48436256228.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5437e0401---99146436430.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/tdslnlm5rl1umgo2uqqlar6rn1/63499854536.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607893022ace3---38101953985.pdfIn PDF document text
    • http://skupka23.ru/upload/m/kufuva.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/garikib.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/rujajarubijufij.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e2fac0e44---34803420862.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608293c81487d---gekefutiruzumujesirasupe.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a01bce79b48---67853340933.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/buvudawidomawopomixubodo.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/defasefoja.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f8ed828fa75fced0f49f40979b2938e9/tajerukomijurog.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/2a6d924165be019b66f88ce46cbdf3cc/88275541416.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/rutivoxekiralumowagukido.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fb8e57e8d812cdbc30365778c5ee2f61/17532915151.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/30499011483.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/tipavivifan.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d3c05adc---40179475072.pdfIn PDF document text
    • http://herve-coiffure.ci/files/zawezisiw.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/mutilelaxik.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/9g06cv121eacab5r6j6dh956b2/fuvudebulurifagafujavovu.pdfIn PDF document text
    • 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_off00011a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A34 17664 bytes
SHA-256: d94deee13db829c39be4a9a8923ccb722cb7aca802cad46cc2ba232531178569
font_01_sfnt_off000148e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160FA 10792 bytes
SHA-256: 837cb04d6c3c9005a557a3d52211e85b8da44b65f78dc81964acd81369cdb930

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