Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8b0bc3b2a62abe5…

MALICIOUS

PDF

76.6 KB Created: 2021-09-01 05:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 367e840affa47870529747516f532b26 SHA-1: af0e6d9141365f6744466dd882835551d4997cc3 SHA-256: f8b0bc3b2a62abe5d9531d7c1679a678d1ba790c398cf9bdcd34694f169c7532
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 or disposable hosting sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous external URIs and the nature of the heuristics suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac9564df78---fazojenivolazorivuxubusop.pdf In PDF document text
    • http://tokyoracing.hu/userfiles/file/zenokimojusewu.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/siwutimapozesunitiboxaz.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/26919827878.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/73578365873.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611f015932cb4---76579085730.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/gbgd8drjje6lucblhaglpspg6g/38701062064.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/66927432449.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/fabozixomepetufotuxefe.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210820_E3FEAFFF3B1FC69C.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/07d2f09e0cb88f2f761bb743af189fe9/84508977453.pdfIn PDF document text
    • http://abnicum.com/files/file/8279491984.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/15868673391.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/82318024995.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/bunipudogew.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/zararenuregive.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/32606447594.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612cb495d6c1d---vomazizisupinofud.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1e069faaed4cb2ab656b41774f8988d5/tidut.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/77bdbe81556a42ce00fe6da4f81c562a/10675912746.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/12939995513.pdfIn PDF document text
    • http://artepcb.com/upload/files/junipaxigagur.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/sapologevezuvumerejulab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=comex+cable+gland+price+listPDF 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_off0000c6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FE 16460 bytes
SHA-256: 5de0dfd5e699c7c609d7da9b5cd032e387aec7e65ed011df1ef50382f1ff1b01
font_01_sfnt_off0000f1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FB 11128 bytes
SHA-256: 93eb06ffe6988f6aa46f9f8b423022576f8bdd8b144f257bf5cff7624eeb4030

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