Malicious PDF — malware analysis report

Static analysis result for SHA-256 840a3d70d4cdf950…

MALICIOUS

PDF

88.2 KB Created: 2021-07-30 07:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 64f8ce76e2cad331706ea39ac2f0d171 SHA-1: df2ff87116aefbbb1eadde66bc4bb88c48e45596 SHA-256: 840a3d70d4cdf95029f1bfc80118953c678e73ad58f667926bfe0466b2505898
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of these links and the overall structure align with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=what+percent+of+students+get+a+5+on+ap+calculus+bc PDF link annotation
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/43d7708d44c0d9e45c84ca419d95ed17/porizawusurosapepajitig.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/60517731261.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102b9b064b76---37338371001.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/busetaxaragerowoxes.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/6012858243.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/fea6e19cbb4e655475ac7f9ef9f8f57f/57148434608.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/jeboji.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/20351389193.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/95768249693.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160fcefae059d7---wibepokizilek.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe19a0a6c9---mejokepapajakaw.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7e6b8e19dbdf9ad0a3549c35e82d801f/26040245013.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/32128842779.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f442fbf2d8---giletote.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/vjgkerfvc842pbttr3nht9nite/27952092495.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/bipazizifetujawemug.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/71949596030.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d59469971b03f187e839fae821c0e503/badexen.pdfIn PDF document text
    • http://contelex.it/userfiles/files/piwokesewogevani.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/eeae78ac0ff9553cf5efa272bb5880a8/72332166743.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/iah7baqs9er7reo6gf368953c3/zikofaginupe.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4eb34a323a---menidaxivewatedumixi.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/tozugipikajuzawudeneker.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_off0000f156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001096d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096D 11176 bytes
SHA-256: 89477dcc5fad48aa83ad1f227e736eed4a0975170996d83ea2636b3a43aa66fd
font_02_sfnt_off00012327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12327 17800 bytes
SHA-256: 90fe2c23a1d7547c2d067c31addb7d5e657f60f4eba33872fb6d9ea88e036c7d

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