Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe162ce73b1cb6b…

MALICIOUS

PDF

70.8 KB Created: 2021-09-02 22:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7a37eb8993ae2d1b816fb1493e717854 SHA-1: b942a4b1725d098e8ffec2e98aa2e46098fa3582 SHA-256: 6fe162ce73b1cb6b71e0ac8c335f2c907cdbb3c03a9218bbd2b325dec1896152
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 websites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics (PDF_SEO_DISPOSABLE_LINK_FARM, PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM) strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4011ef2371---vawuboj.pdf In PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/8a3cd5454b7762f04b692b5cdbe33481/1575532373.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3ae4baca334df3749de6d300a9c677b7/poviwofomasogujitebame.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077a301f152a---72325909797.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/lqh8ljvj0dnfme8656bnvtrb51kv1lrn/zumajidojovavepevasit.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/419be89ac4d26e85aa269b0e9fa12fc6/fogudadoretuto.pdfIn PDF document text
    • http://abnicum.com/files/file/xivumeg.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e5e2820147c---liboxijutirafenawufurafox.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/95657414921.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e429466a12320977b4d2b59bac3ae763/losomela.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/42513491586.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/fakajotefewuwes.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/lasamafidise.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/pogisopugolerebi.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/fajuxoludozawuwilunojug.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/kegem.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/588015f17290c04b7df73b7172232b95/92838356365.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/19061613339.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/508fed13cd0226d1a2ad56955b549dbb/dabegoxoxewogilajetevezi.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/4ngc290l3kvlice1savju38h19/78093770753.pdfIn PDF document text
    • http://zerosquareonline.com/file/6162108186.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/kofavetigeruxeki.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/bopop.pdfIn PDF document text
    • https://destockbaby.com/ckfinder/userfiles/files/50496613234.pdfIn PDF document text
    • http://df-2.de/images/daten/file/72685914483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=american+psychological+association+%28apa%29+style+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51B 11172 bytes
SHA-256: 8d33c8a411c26669efb780b9cdf812c287e5b2ca001d86284f31659e5f2a8c4f
font_01_sfnt_off0000cf35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF35 14976 bytes
SHA-256: 39fbc36ee47b5000ac93859ab1f6fe1d2ded134291b0b3b71a27c31f1150d383
font_02_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1