Malicious PDF — malware analysis report

Static analysis result for SHA-256 af672555ae910deb…

MALICIOUS

PDF

85.9 KB Created: 2021-06-25 20:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75a90b46dc82470b1df752d64921b83d SHA-1: 76eb68f7643275f9179ce264b2475532cf007b37 SHA-256: af672555ae910deb8f4cb3deac92a1863aab139e67a92cdd52ba456c5b2a5fe4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. These links are designed to redirect users to potentially malicious content, indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/b5f2b973f4446004c194d82df93d7cf8/nigilunodibutejadesi.pdf
    • http://architettoangeli.it/userfiles/files/47275774770.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b173833f1df---bawixavolalim.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/6e47a4f700dd9f0a6ef7496436e99c4c/20494874625.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073104088971---47037492731.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091da57208b5---ruvuvavugobafo.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/nokopijebu.pdf
    • https://acryl-bg.com/userfiles/file/bipikipokekixebetur.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c68b64366---zudesojovav.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607958a19041e---jamuririxafusujomoru.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65596785d7---werepesob.pdf
    • http://siembra.me/uploads/files/zixuwupufivujoxizezutuk.pdf
    • https://mimpishiodua.com/contents//files/zifitexe.pdf
    • https://tavio.ru/files/file/62016277885.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8c813de9634ea796f8a461524d102bf5/77233217048.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b032a7a223e---7959791319.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/80976229208.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/407fed77f63ebd1d51e7bebc621fa39b/85202839306.pdf
    • http://championshipsportsrings.com/clients/23492/File/pelixala.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c17285c7f---famujetoziv.pdf
    • http://musclecar-taps.com/js/upload/files/29092555043.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/82c908a0325e9645b75266f278bf1e71/12795893995.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/kifosemus.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/4aa9u5m17vnqllbvrvdbdr3ns4/63259367910.pdf
    • https://alakharia.com/public_html/userfiles/file/32013462992.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=lost+in+the+middle+of+nowhere+spanish+lyrics
    • 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_off0000e918.bin
6f4499d8ee32b7b1d31033e758fcd7418321e23764476be5e65b0c35a44872dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 11044 bytes
font_01_sfnt_off000102a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 16792 bytes
font_02_sfnt_off00011aba.bin
ea9db0bbb6b9643d8e87ab46f4138e3dfa470f1fe33173b69d55f538bb5599e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABA 18928 bytes