Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0de914a72916fc6…

MALICIOUS

PDF

87.0 KB Created: 2021-07-16 21:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 563918e28b61e5672f9f87c3c0221ecd SHA-1: 0dfa92ae5fef6af0ef8d7adda9feed1cd011e130 SHA-256: a0de914a72916fc62cb15d2f0d893a32a64dba60ae62470aac175d2d155bdf62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082b5e1c4a50---65803198153.pdf In PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/xedutinirulikosuvuxu.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/82791187811.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/gegabuk.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/k7r51b0e35naock72ng8mn4e6d/4273103319.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/xarixuvibelugufujifigov.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/72235761415.pdfIn PDF document text
    • https://digireg.li/upload/37199000730.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/19019186043.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/67181000332.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/3c2e8903872f17ebc3a2e039023ec8d6/51893888004.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaaf8d2588---puvepoz.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/funokuteworim.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/8376289858.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/55673160196.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/o9pb1d18lghmgrvmqp0vr3p663/51750492941.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/02dc580651025e06694f136ac3fc2780/medolur.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/25139808271.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/e94da9e748e786fb3ab4b33b17211a98/jetalilenuwotavoguj.pdfIn PDF document text
    • http://contextuae.com/resimler/files/vepidimijulipegekeg.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/fc5e862541a12ef62f8f50e364def5c4/54973618855.pdfIn PDF document text
    • https://genericdiabeticteststrips.com/userfiles/files/doxewimosuzibeme.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/5fc77bcc6468286e8dbe9bcb45970450/zajipaseduraxirige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=growing+celery+from+seedPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 10796 bytes
SHA-256: a9d5d0916021b311398e402610a50231e6120e0a516a93e304a8399a68917802
font_01_sfnt_off00010a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A48 17304 bytes
SHA-256: ae8635731d528659fed718e1a68b77939866169e9aa26b8d9a0ce92c3cb0b3ed
font_02_sfnt_off00013707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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