Malicious PDF — malware analysis report

Static analysis result for SHA-256 2abcd19f3b7753b9…

MALICIOUS

PDF

98.1 KB Created: 2021-07-16 14:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5561289da20958486befd680a703baa3 SHA-1: d3e3a3bd02dac2c4fe1377866d12fd04bfde0334 SHA-256: 2abcd19f3b7753b9820808df6abf3db8d85fc98d67909a47f62fa9fece0660c0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations, suggesting a link farm or phishing infrastructure. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to prompt the user to make a phone call, a common tactic in callback phishing scams. While no scripts were explicitly extracted, the presence of multiple external links and the callback lure strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://nomylo.ru/uplcv?utm_term=primary+schools+in+my+catchment+area PDF link annotation
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d40d4e5aee---77117795773.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/a88ffccb732fb53a2396897cacf7453d/zumezub.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/0267f4c99c81cf9a399e678071a079af/77946321974.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/50554773137.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/pubbbutu5nohnaj6fmtbvn2v0a/81869591374.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/vlntj6v01kqsmq6ekf4tq1s2v2/59283935052.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac819043b06---25846162271.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/57701420256.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/2c1f54627ab2bcbf574b4dd0afa74bd3/52327556306.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/74824087169.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/31007590126.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/823e5e1e552dc3d16fe798c458a31a6f/pivejevuwezoxudizubarika.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/25514054778.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/b96cd2b3c08e05342918540944e75d29/1035357988.pdfIn PDF document text
    • http://drironcat.com/images/file/puvibedasesen.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96f6daeb6---nujajuxofabusosusamelul.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/5336467064.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085de81d44c1---71523858766.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/g4dgvis6c6sko6lld0lf4o5h4o/dutesexawa.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/fexetalu.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/7366bf5a7a5b5663cb3806edbb924aba/90275054002.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/toruzosaxulifaxoru.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/12353776130.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888d40921be.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_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C5 10612 bytes
SHA-256: 4f72f850e8cac9698d3337b00d6904ef43b9169ddcc962c1ece21eb08ea3f331
font_02_sfnt_off00014ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDD 17176 bytes
SHA-256: f637271cfcc12e0aa4716ec5f990ccb75056780c915c670012e2f2ef0f13f46e

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