Malicious PDF — malware analysis report

Static analysis result for SHA-256 afca0c83e09ba16e…

MALICIOUS

PDF

89.6 KB Created: 2021-07-16 05:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1cde3242ed1ad64fcca1f7921092524b SHA-1: 52bffacdf91158c45354c1eb4f0a39a5399fa392 SHA-256: afca0c83e09ba16e550088c0389d865d65d7620c23c52b12ebca784721c770b2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content. The embedded URLs and the nature of the heuristics strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7378ec6c21---jufibiragewe.pdf In PDF document text
    • http://unseenadventure.com/userfiles/file/23368528806.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4cb4562b6---xokovaxig.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/libokubamuxilurumojiw.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/63939510091.pdfIn PDF document text
    • http://championsview.net/userimages/11575582775.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/zazinanepejemem.pdfIn PDF document text
    • http://rhondachem.com/d/files/46634690936.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7173f96f4e---13595772676.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/19995638890.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/kbk0b1fkceaen78huegnaqnmm1/noneruritiwofikazuz.pdfIn PDF document text
    • http://yjccnc.com/upload/files/nixetofof.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/80cb05c0d4f53003ba35112129df2ac4/gagefoluwefigopop.pdfIn PDF document text
    • http://dzbnf.com/upload/file///vexiji.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/tomaviko.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/70005122521.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f9e9e5da5d635c778529fe25949e1625/kavamuroloferaronib.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c960767d1ff---80577180382.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lujilesaribasapilobozifem.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/94331142917.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/160780ff042b23---guwebinafovaxus.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/91eenndrmm6aas08ndji8vqood/96074956657.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/nadudidoratojojijijiku.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/numizonurivina.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d8b1405565e6ac6083bbd6348d528174/mogopoviteliwulip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=borderlands+3+vehicle+locationsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 10756 bytes
SHA-256: 774088fd192a288354d1791f609452de66646d34d9a8e4420771a69a89ab458a
font_01_sfnt_off00011155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 17828 bytes
SHA-256: f8c3d7f27526e7d6cc72b32a4d7c764f26abed5035d31634a132c35aa52c42ca
font_02_sfnt_off00013f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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