Malicious PDF — malware analysis report

Static analysis result for SHA-256 02313ee1d4639ccb…

MALICIOUS

PDF

74.3 KB Created: 2021-09-19 19:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5ae45595b3f1760667547fff46d41bad SHA-1: 8edaef80ded8120f7dad3993fae41d4edcc79c8a SHA-256: 02313ee1d4639ccbeef6ea38bf1e606f87258a5696fdfd6b65acc7dc9b03d310
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple disposable hosting domains and compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and a link farm indicates a likely attempt to redirect users to malicious sites, potentially for downloading further payloads or harvesting credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://triple-a.co.th/ckfinder/userfiles/files/falesaxewowiten.pdf In PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/30695144101.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613918a5824b5---88373457025.pdfIn PDF document text
    • http://newcityhk.com/userfiles/bixogotuvuwigibilokov.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613166b4f1aab---97595266729.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/4701742050.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/79429316788.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/63299524346.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/8568f646563a2edecce8cba5b27fc4ca/16139853173.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/kopikawufu.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210908_B7F113320C5AEBB5.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/41585470405.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141f3094a9c2---dubumu.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/sovubomidewutezofog.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/dafimizelabu.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/gitumokekonumuma.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/sigadaninuravip.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/73773540020.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/jifiluxuritufuvusi.pdfIn PDF document text
    • http://orthodoxnews.us/file/59730760439.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/59840991332.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/36159139250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=floating+apk+downloadPDF 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_off0000be25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE25 17884 bytes
SHA-256: 4068530b21fca8eafbac7a0cbc3c129a741e8c32c3f1aac2dd88e9c4756a596f
font_01_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 10324 bytes
SHA-256: 06d0e3e66e74c98fe141a1d71cdb7c9f77f866723cdc8fcc8eee9c1248169245
font_02_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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