Malicious PDF — malware analysis report

Static analysis result for SHA-256 da11367aa8f9be96…

MALICIOUS

PDF

89.5 KB Created: 2021-08-04 16:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b1d48c9f21f1b05b0ccb31d9fb090a3 SHA-1: 94fcafc53af5b3cb57dabb48bf5badcb38b66be0 SHA-256: da11367aa8f9be968689979526504eabd0a7a6923b8f2ba6defb4450ec3649ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or malware. The presence of embedded URLs and the structure of the PDF, which appears to be generated by wkhtmltopdf, further support its role as a lure. No scripts were extracted, but the overall pattern points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://archism.ru/uplcv?utm_term=why+did+the+industrial+revolution+happen+in+europe+first
    • https://mimpishio1.com/contents//files/mufajaxipe.pdf
    • http://apexnepaltravel.com/userfiles/file/27590375503.pdf
    • http://parkhighclassof60.com/clients/871169/File/kajazenatigu.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/03789bea553d391ded9070ce08d0a28d/24492932515.pdf
    • http://camionespanamericana.com/userfiles/file/35610905677.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/a2aqcvtj7ru75gl7d6vr3absb0/92755210636.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089ec9cbadee---dapojanosiselamejogoso.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084601a2849f---61898157168.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/63f810a6f1bb356b67f5c5832927507c/62824879338.pdf
    • http://kiuanai.com/userfiles/file/97065797597.pdf
    • http://dmscsmartlifeblog.com/userfiles/files/bazilovar.pdf
    • http://godahoian.com/app/webroot/upload/files/62964946370.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/27296e1a92f2e33e290fd1367965cab0/ruzodudinapuzominevajoka.pdf
    • http://doorsatyrau.com/ckfinder/userfiles/files/35097516853.pdf
    • http://abwingssuffolk1.com/uploads/files/tadazewitajogozafanotasu.pdf
    • https://gadd-asso.org/userfiles/file/zilevotagidovakenurelo.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ar5ukrl8e7j29ckk0p87jk0fst/72535017420.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/05fa6ef5e3db7c0762145f6d260220a8/45427586472.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755087de424---87986025334.pdf
    • http://giftboxvietthuy.com/upload/ck/files/33941886475.pdf
    • http://softwarefactory.nl/images/file/99835129977.pdf
    • http://ferrocom-spb.ru/userfiles/files/31478783937.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f33b948f6c7---32785130911.pdf
    • http://interface-referencement.com/userfiles/file/56073757324.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbfd.bin
50fb7d1f281eb5886296458879736120cb765be6b2e5505a5d5a6ac6a4d024c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFD 16084 bytes
font_01_sfnt_off00012540.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12540 16792 bytes
font_02_sfnt_off00013d57.bin
692192eeb9f10e610a51d4cccd15a3c1fe455c5275f5486d2acda7a739fb02c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D57 10868 bytes