Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0bb3e53c722226…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 01:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2705dac6ef39226417df665de73043a4 SHA-1: 31b950705c5f1691ec5a6a1fa069e0ac734e63b2 SHA-256: db0bb3e53c7222260f315d81786e93a61b7b2862e02743d447cb2fba7779ae8e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with several URLs pointing to compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and link farm indicators points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://52fotki.ru/ckfinder/userfiles/files/96049593343.pdf In PDF document text
    • https://lazdynumokykla.lt/userfiles/file/48747815799.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/bd5b333841543f4f5a12cd253dc3ee04/97480428452.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/20474932690.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/tamikevufizokimal.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210902093839.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210914160511.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/nifamiketuwidixer.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/pexalefakisorisudu.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/mowotasitobep.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/d9f9cfb8bd0bb9b7922f91a6ae645e8e/warurozomuwugepe.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/laboz.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/34440629841.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/zoraxazovusagibager.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20033487391.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/45427059250.pdfIn PDF document text
    • http://baove247.org/upload/files/bobamexodiwosiwawe.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/lutekafilogivezelelilobuv.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/luluxerifafobizixaji.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/5372298046.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141637644c6b---82194062322.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/foroxipiwajedusalalaw.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rexigat.pdfIn PDF document text
    • http://espokebar.com/uploads/files/95804109646.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/virimapogelezupevugopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=batman+begins+putlockerPDF 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_off0000e894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AB 11100 bytes
SHA-256: 8e06178f2bd343820ab29a2621ce55995b8ae7303c7f0479ee202bfbba37c38a
font_02_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 16040 bytes
SHA-256: 6d2ff811b3bddedbc00120a08100f804c3b9f9dd2a1c0cf20bfc2ff09002b3e6