Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb11749dac74fa5…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 09:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ba94ccbf4e8fc15ef932d9295bfe934c SHA-1: 24b8e3f42787e2c666ba801770666bf1a2d0ec25 SHA-256: bdb11749dac74fa589b05e11ff3b065f076eb960864616fcc87d228bb1af8f9c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161206846e436f---75613676696.pdf In PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/5dq2fnoua5gl2rle1v7jffohi4/5043701786.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/guvotanoxubatok.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/tevolafezi.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16113244078c3c---xuranezulotolug.pdfIn PDF document text
    • http://innotack.com/userfiles/files/pukuvesizudosavi.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/99e72048143d1c051b43de6e61c97701/3606590231.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/likiwepakavep.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/1g5gnk9qh1tpsupe5ougdv1tb4/sokozagijiv.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/xanugumulotidu.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/42107809251.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070971846921---30928957406.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6d0636e2---borijovafomepomixonafozox.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/ralenovabuvoturaxi.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210826_044550.pdfIn PDF document text
    • http://iltorg.ru/upload/file/5051166670.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077af83e3ef2---zavitegoliperabewesoj.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/11260004215.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f14ec439ac---53670537292.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/2u6emgjkeid72onqhcktl49rb6/bizekebon.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/d2f582637efeea0cc729a13b59e9523e/99931897007.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05ec82de20---zivosolenevititonen.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/19224060834.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/judoxusaj.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/qhmftqi5g64a9718dmn3tu488f/bifugizedivowaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=fairy+tail+episode+orderPDF 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_off0000e3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A8 18556 bytes
SHA-256: 1e3be1cbb7459a4abac0ec4fc1e16a7973b989d5667bfd20879cb56daf8856d2
font_01_sfnt_off00011390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 10372 bytes
SHA-256: f8a6cbc5bcaaf941ceeca08376ceb2b69f701966a0f01edebf25ed6926a90623
font_02_sfnt_off00012b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1