Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc81cf6d7c42f915…

MALICIOUS

PDF

99.9 KB Created: 2021-07-22 14:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 039d800bef99025c6efcdc4d55bed738 SHA-1: f8a4c5207014572be406338bc4b1273c62007a3c SHA-256: fc81cf6d7c42f91584ce8dd52e2cf771a424e76c1b8bc27c944199874e4e145b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous links, many hosted on compromised WordPress sites, which likely serve as a link farm to direct users to malicious content. The presence of these links and the detection signatures strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://kar360.com/resimler/files/58699743177.pdf In PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab17ca8d44---merakuduxemakidanegabuxa.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/53q2ffnmm72jep9dai2t8abduo/3164996625.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0cad3926---xesanevo.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/90463602442.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ab4594ed8---kamusuzivepofijaroluvum.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/xuxojoragafokex.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/85068744038.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/tajuvupenadileluwo.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/vusorepodo.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/56390500442.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/7ec63b2d7afc26b29b1c30b5ebb6c51f/nitizuzebexedipenasif.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e58d1fa2f8c612baba64bfc3a376300/8726636865.pdfIn PDF document text
    • http://megalaserasia.com/upload///22032451004.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/2780981701.pdfIn PDF document text
    • http://superplasticizer.cn/d/files/zoxed.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f25342def---vonisanoborufafaduk.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/77170300115.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8a05b078f---12552528191.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac0bd3db59---80394961606.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/80050594152.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/nixesajumujokadotik.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3edf1396ba---bereguwegovak.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16087836e5da5b---71168515760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=phoneme+meaning+in+englishPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 23836 bytes
SHA-256: 08424fe2f6c96efdb14d6902f0d3c452639edac28f6bdee93f9369e0de91f649
font_01_sfnt_off00013c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C52 16072 bytes
SHA-256: 43523becfbefc0ddb4744758b55a028bdbbad0d5a67cdb8d77c436db9c152cd5
font_02_sfnt_off0001516d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1516D 10356 bytes
SHA-256: a43167a87724bd5c6463a21dda9eff19fb98283c9fb5c6b7b406b091f661c1ff
font_03_sfnt_off00016890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16890 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1