Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f0855e18282dd1…

MALICIOUS

PDF

92.5 KB Created: 2021-06-30 08:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a98a155becdb696ca282ceb9d1fcea5a SHA-1: 276e50e36bf71c243dfe62a13f14c7d28eb6550c SHA-256: e6f0855e18282dd12cea7e48c2a90e8782c24071137ebf6c50f97a02fc7f04b0
204 Risk Score

Malware Insights

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

The file is a PDF that contains a link farm pointing to multiple compromised websites, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'password-protected archive handoff' lure suggests the document is designed to trick users into believing they need to download an archive, which likely contains a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c595bf31f62---7411034442.pdf In PDF document text
    • http://lmyc.net/clients/875386/File/76867065109.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/11415978480.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/70427825030.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160935103719fc---88910227679.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/16544176034.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5bcf6df15---lulerafejuneraxaxuf.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3a700720e---gajuvikaweviza.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/93149664437.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210615183106.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2f7b9427d---wikakubude.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160b9aac5a8790---manabodezexoja.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b30fdc9d95---32981784702.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c161929e31175f79e9758b470f37a8c2/62560881260.pdfIn PDF document text
    • https://stopserv.ru/files/file/tifugutesoviwuvurefeb.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7e6307250---9286728141.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/kovadimuzivusedas.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607850f5a3cdf---16384732731.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4de6748fe---49310224892.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//kurasagomapatesal.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a35026dd45f---tuwuvalujaxunix.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/potubowotamapokubulitomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mobile+hidden+camera+android+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 10736 bytes
SHA-256: 251a3b9c42924378e9734e8c1c3abab54fadb64336632dd626c6782aea1c0091
font_01_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 17768 bytes
SHA-256: 063149272809af498c5f7be01dd776d00f661542db6250b07b3cad5c399b3e4f
font_02_sfnt_off00011cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC1 17936 bytes
SHA-256: 78f174ad95395ef24248de4e474c790a816f24042ba54d7690096c0e354b7243
font_03_sfnt_off00014bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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