Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f2d567a59f6ba5…

MALICIOUS

PDF

86.9 KB Created: 2021-07-24 18:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30a43d78fb384b9e27cb6d0a16a27c27 SHA-1: 35d5261009ab0b3a9b18422203d3c9dc671d1818 SHA-256: 92f2d567a59f6ba5f78d83e8ee07800d676492a091febf0f094a6707e8c1df8a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains an embedded JavaScript stream and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The presence of JavaScript and the link farm structure suggest it is likely used for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://adamlegal.com/userfiles/file/22342190736.pdf
    • http://pho32shabu.com/uploads/files/20421459705.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/cb3ee7cd8245c9cf0e59d131bf22cd31/48024839860.pdf
    • http://alteanetworks.fr/img/file/48748800832.pdf
    • http://dzbnf.com/upload/file///gotupagunopufenevipomuxo.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083178ded1b6---faduzesedezitudop.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/cf2f23c13cd99c5f335fecd3966bd03a/36528380593.pdf
    • https://sieuviet.net/webroot/img/files/rirusuwidutafudo.pdf
    • http://karate-talence.com/newsite/userfiles/files/vuvapexurowumu.pdf
    • http://www.siscbolivia.com/admin/uploaded/fck/file/solojakekevezarugekok.pdf
    • http://altelaw.com/uploads/image/file/kokimopofofosiwiras.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7ea56067c---80087477516.pdf
    • http://healhumanity.foundation/userfiles/file/zomufar.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/1f1da273f44171c27bc21d075c22d016/vikepop.pdf
    • https://cooperspick.com/files/namogizidavojoxibufid.pdf
    • https://vildmarksjagt.dk/userfiles/file/wujupofogujitiri.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/9cb6b4cbe0e96fb0468941bc7dca8359/38652609612.pdf
    • http://szao-spb.ru/images/news/file/87837140069.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/84c1f808f29c964007a9d3b922938ee4/91079308988.pdf
    • http://kingsauto-bar.com/js/upload/files/kedawonurizebor.pdf
    • http://moonlightmontessori.com/upload/files/nemowupupixapilejujine.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/pupodepupizusiponamedul.pdf
    • https://soudurelauziere.com/upload/editor/file/sixitirap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ingilizce+kitap+%C3%A7eviri+fiyatlar%C4%B1
    • 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_off0000ebd2.bin
ded315daf39c23804225b2b13659910d4dd3fff6fe96ea19f8f7bfc60184abc9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 18968 bytes
font_01_sfnt_off00011a23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A23 16792 bytes
font_02_sfnt_off0001323a.bin
44fec4163693ae55b74b982e66ddcb1ab16ea43566f534f3527c40622b1fddba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1323A 10896 bytes