Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf429d0aa840dfdf…

MALICIOUS

PDF

75.0 KB Created: 2021-09-13 14:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 823a6c35acac488efbc62dd2c89589aa SHA-1: 992d5d858b814fba1729eafd40a3866d6b5bcb42 SHA-256: cf429d0aa840dfdf20479616083c32ae9ae1a0926d27e9df5802b900b6862a09
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm with numerous URLs hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The presence of multiple external URIs and a link farm on compromised CMS upload storage strongly suggests the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://ehomeforeclosure.org/images/file/fababakazitafasilifepimu.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/brd1ievf8plplidiu97evfobf6/5139991547.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/giiq6qa7aq3b3qi6ssmc2kamho/94526263252.pdf
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/gaxotinutet.pdf
    • http://copy-office.it/userfiles/file/887611880.pdf
    • http://rw-hse-businessconsulting.de/userfiles/file/90150449277.pdf
    • http://efuegypt.org/userfiles/file/16126951351.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613062ccd11a6---41196283933.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/16871934046.pdf
    • https://oolong-dining-co.com/webroot/editor-uploads/files/laxinugelulojipugelilodo.pdf
    • http://gcsiva.com/files/userfiles/file/69135778643.pdf
    • http://zanethompson.com/userfiles/file/10997920420.pdf
    • http://mc-opony.pl/files/file/70600453486.pdf
    • https://egf.tw/test2/images/file/sizak.pdf
    • http://n2nnetworks.com/files/others/37261564946.pdf
    • http://fcraregistration.com/UploadedData/file/babitanapisijizumav.pdf
    • https://wheelmartthailand.com/image/upload/File/43101173719.pdf
    • http://kutyasturak.hu/images/files/43539977207.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344e691a083---juwuverupepepufeju.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e05294d7ac79723fa0b63755f9041bd6/newunanes.pdf
    • http://studioguagnoni.it/userfiles/files/butevisopaginonabif.pdf
    • http://yule-sign.com/upload/editor/file/20210908102435.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=acrobat+reader+for+samsung+tablet
    • 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_off0000c0ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AB 16792 bytes
font_01_sfnt_off0000d8bd.bin
0e81cc3044e83baf0fc170141e0446569830a92993222d8a2e1f3cbef0e78529
pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 17092 bytes
font_02_sfnt_off000104f5.bin
a6e6fc265af0b7b52041b7b1eea332c2465fba2cff4c3d65350f004c11e67162
pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 10948 bytes