Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c681fa29d42f144…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 06:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 02d0227613bcb701ad3a8e8cc70aba7c SHA-1: 781a63b34163626256bc0ba58b07304b3b2f205f SHA-256: 4c681fa29d42f1444a5823125d367c49856788b6766128847cd9bcb0d8239760
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=sample+phd+dissertation+pdf PDF link annotation
    • http://sualpturizm.com/userfiles/file/86028578973.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/tiwamusobedopanakube.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd047ef12c---fixujadadiva.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b2189acb8---velexikilowojixaboritumeb.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/6vbqalkaj9o748c6i7qnpclqp6/7149933960.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/tenasatunujonopipinug.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/malakupo.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/fuzovovatogosimuga.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608808846fd29---31563350039.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fede281fc---84301659142.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/28655237394.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/3254022a32dfab22066e9ae8f0663a4d/33218854452.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/rararifugiwulomaxijofi.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/35376645448.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce81097e5f5---71863944161.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://munsusa.org/userfiles/file/20210812154837.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/79289309559.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1a6d65d7---vagematoma.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/rawufi.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/pulezomanika.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4247f9564259dfa8246bbca2f3a7e28d/rarepopenanenolefam.pdfIn PDF document text
    • http://srmhomes.com/images/bulk_images/files/85863100918.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_off0000cbfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFA 10836 bytes
SHA-256: 8b1edea7ceb9ba434d8876cba6c3b339484fc701e77336b300fbd7aa326a6e45
font_01_sfnt_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 16896 bytes
SHA-256: 9d138ace5561776736e15022812d8e9a9a6010b1254b3069f0ca23bfd75618ea
font_02_sfnt_off0001108f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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