Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3b3386444df454…

MALICIOUS

PDF

89.1 KB Created: 2021-06-30 08:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3c8ba7971b41679613618ec6a8ae7a40 SHA-1: a502b600edda22098aa9b0fad683e2e9b2b042e2 SHA-256: 8c3b3386444df454f52e7b9be5d5a1262877fb6392100c41161bd7905586b856
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics including PDF link farms and callback phishing lures. The ML classifier strongly flagged it as malicious, and ClamAV detected it as a phishing trojan. While no executable scripts were directly extracted, the document's structure and embedded URLs suggest an intent to redirect users to external, potentially compromised, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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) or Microsoft license-boilerplate 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://wuxihemei.com/ckfinder/userfiles/files/20210605_010644.pdf In PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/seride.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608681ae725aa---jalurem.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160b957afd0926---vuwediropeluxalitu.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/7111415033.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1569d0062f---10123569023.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xilipazibafugosanenot.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/fibumuxilin.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/6ol99tr81seinjsjlhv7k0b3or/senomuzizifisavarowaso.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160aa30aaa7c09---gedugexixepururaw.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/97a14b5bffc1e7452c4502f0f3b0b7f6/14861978389.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a5669669e4dc747b7c8b329899b02b59/36172839055.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/91174015104.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/73566839483.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836b42976e7---15717922229.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/sakikoxov.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/zaloniresexetokofu.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/44154407197.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/bibejapatatarizeba.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdcf8a77a5---31238612314.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/6f9da1c16a27ce894f52cfda1bd46fcb/zenobafozus.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902bd1752a0---kazazomevinakibepileba.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608620ef277ae---towufuvuwetuna.pdfIn PDF document text
    • http://z500.si/files/siwafepajexonimupitabewuz.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/lufkgr787ucl58utjsfchh76t5/ripujazeja.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/73164898697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+watergate+scandal+that+began+in+1972+was+triggered+byPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 17100 bytes
SHA-256: 64a99a785f9cb44da7264f98ac0929dc292eb8a616f9bce8bb0a83cb58ce566f
font_01_sfnt_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 11224 bytes
SHA-256: 62cbaa4c2b09030b50807e5ec2c99c2280fd60952296dbcba02e309234eb6f66
font_02_sfnt_off00013e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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