Malicious PDF — malware analysis report

Static analysis result for SHA-256 085c29bbc9e8ca93…

MALICIOUS

PDF

70.9 KB Created: 2021-10-02 14:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 036e852af4bf1a77795ea1d813d86d65 SHA-1: cb5bcef011b877a865a6172cc19c086a1fa3665d SHA-256: 085c29bbc9e8ca93103d53fbc3bab1793e82416684083bbb0d9b006c0d2bdcc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting domains. The embedded URLs suggest an attempt to lure victims to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=swot+about+yourself PDF link annotation
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/46d2c178345c99b6e1a42c6e85efa40b/13379701125.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/39072854458.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/79601588600.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/583508b51f5b35037cacf964554cccc8/wumibopisezebe.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/11778348286.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/mivuduxuveteja.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/62354700517.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/86583310501.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/betubofizereduku.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/gogawijedegubupewafewoxes.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/79430159368.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/zorudevupekojewalada.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/93074194103.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/kuluminozilusosekuvigil.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/jifukexaberavivu.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/tewumaruxawev.pdfIn PDF document text
    • https://mangallagn.com/images/file/25757363341.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/61897606115.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/vujexi.pdfIn PDF document text
    • http://ud2-140.com/files/dazitigumus.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/11961223447.pdfIn PDF document text
    • http://www.bash.cl/media/file/fafoj.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4tjouurcsv724jmg4nqn6evcar/31264567360.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/1548923500.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/48411196220.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_off0000b43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43C 10524 bytes
SHA-256: e328c352bc6822e06a8b6e0342886eeb6d95874ab34b7d3f704129557cf52649
font_01_sfnt_off0000cc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7A 16228 bytes
SHA-256: f9a0c2d2ea38bcf3d81e95aa50b50aad755d02b11577d3bf0b3633ac24cf2985
font_02_sfnt_off0000f59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1