Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb8cb4c7ef67f63…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 12:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dcd4a304eeb88dc24d60033b7aa1199f SHA-1: 28fe04ff74ca0972c6abfe4424aaa7deb6251f10 SHA-256: dcb8cb4c7ef67f63e6802b7f5df6d70717a5cf367426c2c7e4be8acdc10047a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques commonly used to redirect users to malicious sites.

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://sportservistocik.cz/UserFiles/File/35053228499.pdf In PDF document text
    • http://kenhuffbuilders.com/userfiles/file/3003252094.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__613B593C5CB71.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/54895485107.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/guxelukulanegib.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/7125361fea6911132d6d3b6fe76c462c/45790654024.pdfIn PDF document text
    • http://leeharringtonhomes.com/userfiles/file/deralarowazonazapomulax.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/57650320371.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/janotefavedej.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/genezawufi.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/20798465655.pdfIn PDF document text
    • https://msiutilities.net/documents/remalamonise.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/bobunejurezunonuxa.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/35425796171.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161347df894aba---xuluzuri.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/pozosusaf.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138fd4fce340---pefoxikirenonaregumu.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2830c5a7e94b357d7607d733ac7cce60/51481417236.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/dejemuramovuwivatigepi.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/71968773215.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/5786707290.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/40844462393.pdfIn PDF document text
    • http://sql110.com/pic/54468864160.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/zavarenobibezabawunaforuv.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/soxolagazak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=andropen+office+reviewPDF 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_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 18324 bytes
SHA-256: c6f5e8e0628b13e678720ae39ba7c7c24d2cff151d238e7bdde18199e6aa40ba
font_02_sfnt_off0001303f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1303F 10272 bytes
SHA-256: ab2224c604f87aa74d8d4953baff082b1291bdb868a3b78b63d47771943a0eaa

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