Malicious PDF — malware analysis report

Static analysis result for SHA-256 df85fb7469074141…

MALICIOUS

PDF

91.3 KB Created: 2021-06-29 10:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6af21e0262be545ce20907d62620224 SHA-1: d781b0ab7f0b6c742e6f28c7f29488ba7d39bae8 SHA-256: df85fb7469074141c0be97c9b2568a32050be51ee91efe3d3de6cdcd6df97e53
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised CMS upload directories or disposable domains. This structure is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sidufevewojufetesapoz.pdf
    • http://artecgroupservices.com/imagenes/file/nomubopifoxizew.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34493a5d3---3669878814.pdf
    • https://kund-in.com/userfiles/file/fabusimoxojix.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/2jro94ftqgeprim6icdhj93ce6/gavopoxejuxezuwul.pdf
    • http://lab4050.com/upload/editor/file/kelosobikajojidamaxad.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0daf34c17---zevesazesi.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d6d3b813e2a4a3ec6e6aa02f217389dc/wedinidukumaku.pdf
    • http://hum-lucknow.org/test/fckeditor/file/finoxezupukibuzawutiruxir.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607947d0ee265---74477733937.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c5eaac65c43---77123890478.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f749b49abf---49022033628.pdf
    • http://nuovartea.eu/userfiles/files/4362072579.pdf
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/16410498232.pdf
    • http://robertfeinberglaw.com/images/edit_images/file/tixopiwete.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/f7t375taaisnnijfrmb2v9l7gj/buzelos.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d82c725ae08---bukiliwak.pdf
    • http://7166867.ru/ckfinder/userfiles/files/gafivojexulejalilurabozuv.pdf
    • http://webursitet.org/Files/file/luwefi.pdf
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/59390986712.pdf
    • https://unosms.us/userfiles/file/97163546245.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/sobajomineranoxiwotuv.pdf
    • http://alexlunacoach.com/img/editor/file/puwefefu.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0vdj9cq45vk8qugum2lqf56p56/janaserefebu.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/58ee7911dc292b1eb0fa3020ee8316cb/kiveribunivasuvemevuxi.pdf
    • http://naoshima-habitant.com/fojogetaroxuwilo.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b082f7acf2d---lavewogodeliki.pdf
    • https://zweefvlieg.net/userfiles/file/zakalasarugusixababemena.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+break+down+junk+in+fallout+4
    • 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_off00010320.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 16792 bytes
font_01_sfnt_off00011b32.bin
16db9dba1f5016862dc1b8b71c302c17cf4dc66a6d12b56da6f5de7b1ca4e7c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 16840 bytes
font_02_sfnt_off000146a5.bin
dc91a041c9123cbe40798d457dd3a00798ec6f5a996a6dd551376638123d7f5d
pdf-font-stream PDF embedded font (sfnt) at offset 0x146A5 10796 bytes