Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e20109e1bcc7977…

MALICIOUS

PDF

90.2 KB Created: 2021-07-01 23:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44a40a32bb23b13dbfed9d9cd289e371 SHA-1: a509923c46c58e2de2244d8a026202d3401c5f56 SHA-256: 8e20109e1bcc7977dab085f3cf4f3f769c8c4ed81b94c21bb04134d367946ad1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it's designed to lure users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://ezibra.pl/upload//file/gamoxurapapupalixoxede.pdf
    • http://ronaldtan.nl/images/photo/lunifutepisexowevapegi.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/pumavixabuxuzo.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607417268e543---954547998.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d70503cb62b---41711685411.pdf
    • https://topinsolventa.ro/userfiles/file/gimuwasuridopirox.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867318cbf2f---63473443600.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/95c67d65f4c130985cd230634729b774/morejam.pdf
    • http://secretlove.ch/ckfinder/userfiles/files/16827627974.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e01acb555a---38311077528.pdf
    • http://thegioituigiay.net/uploads/files/zelik.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba70b6b2b5a---tonesoxegadizegozazewo.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c1cd4f152---72419959836.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/jtkho8a59fmoj8a422n5ui4e6m/mupitagiluxeri.pdf
    • https://sportsht.com/userfiles/file/rerelujusozigelu.pdf
    • http://colescastle.com/clients/875019/File/watadujadebaze.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/67e5a5497ad45d15ee516c277ab54016/gozarunagifezo.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc553250b16---pukaxujinisorilowujogag.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/vi6lnaumomecodh2l0a7u85381/sulume.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/locnkrj5t9tkc98m9atkvlknq1/41560453091.pdf
    • http://alemotta.com/resources/original/file/19886998503.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/a8h8abf57ajcma73unnegp555g/gilokowu.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/059099f45d33a1abceffee359f166c54/62642596104.pdf
    • https://fisheaglesafaris.net/pics/user/file/51134361759.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=interaction+of+living+organisms
    • 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_off0000fe17.bin
d686b02d8df3181ad7914d6c37022258cdf300a1c9c12f38bdc2a4e050849dab
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 10696 bytes
font_01_sfnt_off000116ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 16792 bytes
font_02_sfnt_off00012ebd.bin
2b46aa84bbe11cb825c010c53df80c08fcad043d6b92260ad2099bf32e7bb612
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBD 17320 bytes