Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb5cbe0f31d0810…

MALICIOUS

PDF

101.3 KB Created: 2021-08-03 05:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8d23fcf30e69a3dbd2a52aacac72c781 SHA-1: 3911a83ef6b179511443afaf07feeda416054810 SHA-256: dcb5cbe0f31d081057727723ad94b9629063da89c84a81d16f077b0d51a508f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan variant. It functions as a link farm, containing numerous URLs pointing to external sites, many of which are hosted on compromised or disposable domains. The presence of these links suggests an intent to redirect users to malicious content or phishing pages.

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://qzgj.cn/upload/file/70271709171.pdf In PDF document text
    • http://dobrasekacka.cz/userfiles/file/lifepugefuj.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/005pq05a13m4a67o03v43euar3/30742100329.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b917a304d---5400931539.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dfabe146f---91900103936.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da3fc2d101f---lojituzopidolasutibab.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/72557903845.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/rslmn76qferjec0c7dp5f8ph5m/rosasefelud.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160766bd5c4937---nanurakabebeje.pdfIn PDF document text
    • http://wahibluedevils76.com/clients/5/55/55d7338a7abcce318bc847d7f34994f5/File/82928994020.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7bc34b8ab---pevobezaxex.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/17135536202.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/2462794486.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/18155539223.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/66143894124.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49fe9d308f---97227130105.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/fubezifizutuvijigefuzona.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d18dbc54---peparaxetibejewoxos.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/36108112154.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/99e9abefabe867a83d860f1a958d0625/48915499551.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/49712283294.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160722be3447d8---21523594039.pdfIn PDF document text
    • http://homeopathyhk.com/files/91936583162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=who+does+elena+end+up+with+in+booksPDF 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_off00012760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 17588 bytes
SHA-256: cc16251278a07bb3b98846ecffbc3e485aea6dd47bd2a96fe734c884035b34ea
font_01_sfnt_off00015580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15580 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D97 10800 bytes
SHA-256: 1f8a3bb319b404e9dd6349f1132d6024aeb1044ed9f312b002eabe99038bf73d

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