Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c23dc138ef8348…

MALICIOUS

PDF

93.5 KB Created: 2021-07-01 19:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bafc24d9534942f4e6909aa1b7e773ab SHA-1: 160a2eee31248dae7ab5c1e0015485a1baf007fa SHA-256: d9c23dc138ef834851efe79a09fff17717435f01105d99f97f14e30b32618dd9
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

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://crewmak.ru/uplcv?utm_term=meaning+of+the+word+alliteration PDF link annotation
    • http://hy-concrete.ru/d/files/lagizanekuparokudapu.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/67753234737.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/8a78a9d73450b56df7940ba5652ac68c/33726477056.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/54adfed207ff874fe830fbc3fb898487/98308378997.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/0i2rr3nfpajgt2ko11b0fpem61/dadazanokogabenez.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9104ca8c2e648124f7b383bebe1a6320/modalawevufotapagejefo.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/notukorasukizogovemojode.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/32f5a299511c6a18d747cb636f9a63e6/sunigugewupiz.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/gadikerafe.pdfIn PDF document text
    • https://t2sc.me/userfiles/zatewikepuvutavarinofikix.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d89acce0aa5ac0b74c66f57a153149bd/diledegu.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/3dd8fc71b98be13d3398498a5674dd9f/71564311743.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/duxiri.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/mewowozomogegewe.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/0d0a802fcdb7b60fb56e4ad7c514dcd8/79366741265.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2dd6d9f36---buzopusomivusapemid.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/falut.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5904715699---32010784780.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/fbd9a039e69a201257a488ff248d7b54/88900821037.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609fed6191bde---96990260717.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/jotonaxolomo.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb6bd85665---fewexe.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/masizafa.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_off00010c0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12421 10544 bytes
SHA-256: 9c59f5083cf8c999ab363b28ea33e0b0d3e104d06e4616a00b16c034b9a03b84
font_02_sfnt_off00013be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE7 17168 bytes
SHA-256: d68d7eb1307fa127d77f56803d85d059a4db61e5f9591ace5a8ec857d930e5fc

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