Malicious PDF — malware analysis report

Static analysis result for SHA-256 24aff3f43aca6c94…

MALICIOUS

PDF

86.4 KB Created: 2021-07-18 23:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8228810013a1ba6d179d8202be0cd424 SHA-1: 2feea38892b56db7cab539f4dbed53806f3f45a4 SHA-256: 24aff3f43aca6c94cb3a71ea75b994fd70b9bed88af956fa9bef8273639dfce3
156 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress upload directories. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bishopsalamatkhokhar.org/userfiles/file/9207171408.pdf In PDF document text
    • http://cnkls.com/userfiles/file/1624378615.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080845e18995---fasatukifaxovizofefejen.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/b45a233a2f92971418b8ee7714733a52/logagebodufutenedu.pdfIn PDF document text
    • http://www.moyekolodin.com/files/95822833227.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/89eb47d210c17b323e3c75877340b4e4/9138763816.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d54feed9ed---38475420218.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/68001537897.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/4546910488.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/1222830894.pdfIn PDF document text
    • http://abnicum.com/files/file/gonidiwexopafuvu.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/vulidakakiwexanuwevur.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61e9d30a9d---jafiz.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/dazanik.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/wopudadisiwawamujeb.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/n5r5uoola40tokf61qsoo6q0d6/48601072879.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/i81fdvkq3mur4qu18fc59s4v4p/kazijazutijivibaxinu.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf70686e44---fobisukavenoborufejodi.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b3ea8188---wilosovajoz.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/jd0qgb28rg86srkbbs579c15dj/getaxesi.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3db81c4c1e---61461898899.pdfIn PDF document text
    • http://normel.org/files/upload/file/jofujoxemujip.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/26146571114.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/12365938217.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ae571b53e---65499447034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=hero+wars+puzzles+onlyPDF 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_off0000ecc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC8 10404 bytes
SHA-256: 504d43bc25e08638a2b1169860d640b3238b6440d7e04899ca8fa333271c0b7c
font_01_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 18656 bytes
SHA-256: a075cafbd0ba8984a53fb4b1a83d53d9c8588022c4909bc55952b962d3b86309
font_02_sfnt_off0001347e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1