Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14ef3c826b04881…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 21:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 98bec6a5318a7c0fd0c48b17d27ade6e SHA-1: 48e3533512653fce86d5b7a37bbf6f10d4365352 SHA-256: c14ef3c826b0488150dd0a7cfc48e697d53d71bc323c885c34abecda15b67b6d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the attack pattern of luring users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/uplcv?utm_term=carx+drift+racing+2+cheats PDF link annotation
    • http://acril.ru/ufiles/files/35640261012.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/lixoxat.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/64248816641.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161310ec02e162---govemakosivatu.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/kaxotiwesa.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/xewuwewazateduletikugoji.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/61701216591.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302c91524fb---riloritolubaxeposejar.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/varigorobaralinu.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/miwamarozofel.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210911181202198.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/46862548042.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/sakidodinagosuvati.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161450a2329cb6---28850620919.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/176780.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/fab833809c5328bc6ac81a652b8afa40/97050796395.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/36751943854.pdfIn PDF document text
    • https://consultemergingmarkets.cubsindia.com/files/wotopabotakumekulodugawu.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/39023563291.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d18ecf3d---33957657851.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/jiwawukamakogoxawexojet.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/rakinetujito.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/52461488690.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/6318b58c45d8c8c7e765089074ac1380/61520291590.pdfIn PDF document text
    • 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_off0000dbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 10840 bytes
SHA-256: b5730ed53d08498cc98e69891a09ccddf17686a18884494acf16de6eae09345d
font_02_sfnt_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 18936 bytes
SHA-256: 3e9de04d3cb4b7f6bd2263d8c6589d0aebcbeef2ffeb5cd753ff7a2d541057bc