Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd53d48ced94638a…

MALICIOUS

PDF

87.9 KB Created: 2021-08-29 15:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d4beae55b2e5c249eea8ed9c1c3f8ef SHA-1: 79c680168f0ccfe12ce64d11261a8b8dbe9d1c63 SHA-256: dd53d48ced94638aa86e9f40e274a152444b5b58dbb11339604160ef050255b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://archism.ru/uplcv?utm_term=vector+components+examples PDF link annotation
    • http://cnmrobotics.com/files/files/2196546189.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/nezaziraje.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/iu06q0ogsmb7t4fcctgfh4h0h6/fobefatimetoj.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/63962904024.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160ace7e0ad71a---xetek.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/76732146450.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/pabuxokutu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7cbcq75f60tduu0qv5c9qmdg67/dupewokosovo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612b2ffe68622---32691279967.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/53330856360.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/asvfhnit54v6egi5tuf121t9j5/nejajulafipuvufo.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/45573971385.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160747b9d33a2f---xiruxosovifo.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1alrn2e396tou7pf1fcbu1u9l3/58260558526.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/pexavitopiw.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/69248449924.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/ruvitigafoziwe.pdfIn PDF document text
    • https://ip-pharma.net/data/files/29294375658.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210726_123514.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/nobadugobiwovuj.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/jotidovum.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6769e8dfe---danuxafunakir.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_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 19052 bytes
SHA-256: 2c36ba5adc209f88665ef2205a56df6dd4bc803c198e74942bf3c356c9ad85c9
font_02_sfnt_off000139d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D4 10512 bytes
SHA-256: 24b5af35e57fa7195d3ea800b69b913d7ad7e8a7542badfad26b2b400599cf38

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