Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd2fff105ce83b2…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 17:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a8329528965c7e8c84fbf26521046f5a SHA-1: db6118e9bba13193ed9dc48ad9aa588c3a106988 SHA-256: 7cd2fff105ce83b294f4565365c499677edf1d80b08f536071e2668a0199c96c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users through these links, likely to a phishing page or to download further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://grouptm2.com/contents/files/jedodi.pdf In PDF document text
    • http://energywork.pl/userfiles/file/jutolelivanugobuka.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/99199529352.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/71281226204.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/danajogesabajepefidabom.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/suzomavedisudedajunirapur.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/79782582211.pdfIn PDF document text
    • https://tekstilkent.formenemlak.com/upload/ckfinder/files/donifezetinexufafakapa.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142726e1c912---tatokemego.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613012ff4a5f7---72909381595.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210904011257_1325653108.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/4vs8tc4bn2ssk1m3hrne7sg5cs/81606955352.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/94252252401.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/88019912274.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/529bf485e2dae7e1a201c515c5167935/bumekoziw.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/f9788d882f0d708daca01910b690a7c3/palofedebokit.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/658e66b0fa42869614fdf52611b02a1f/73786535460.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/69440569292.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/56438498081.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/fitufim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+sa+cheat+listPDF 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_off0000ac3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC451 16496 bytes
SHA-256: b07c9928c633edf41f44e973bf9229d156633228b84291da06d8e53b7be865ba
font_02_sfnt_off0000ee95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 10040 bytes
SHA-256: 3ad35506276d4dac2728bd85cfcf276e5e95a4140f5a9d9ea9a95fa1429be172