Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8f6a389204f302…

MALICIOUS

PDF

74.0 KB Created: 2021-09-10 20:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f301c5d9a3e8f0f13065068942b170c0 SHA-1: fd6bed8dbd459c7569402d9c02fe5077dce9b684 SHA-256: bc8f6a389204f30207ce59d89bc3c71ee0a2a09571a74d65dfa47d502001a059
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 domains, many of which are hosted on compromised WordPress sites or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure suggests the document's primary purpose is to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://celyroknaterase.sk/editor_uploads/system/files/52841413987.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff9b981ae---pufexisiwelareromuzesabi.pdfIn PDF document text
    • https://dom-titan.rs/files/xuvanotikisofugoj.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/96397117177.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109010729599334.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/92432311692.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/fofipalijoxarolizuvebadi.pdfIn PDF document text
    • http://360global.ca/userfiles/file/95398940456.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/zizekaleloturosifowukosa.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/fidojogufojixewufuvetawaf.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/janapukufasipa.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613888ad19c4c---jerizerux.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/dubeporojarerigeji.pdfIn PDF document text
    • http://schokofontaene.de/idata/mevufejamolaveroxokeke.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613131ab4226b---dupijopugalawovisoxarofes.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/rakuserimosekoxilo.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/s8gkgr13qpgcufnq21v6q3qk10/jupurajakalos.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/9829470616.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/12504397653.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5b0d6cd67---jururodi.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8196bb4573e72ce90b36354d117c92f7/novidekuxexilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=salon+shop+near+me+open+nowPDF 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_off0000be15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE15 10488 bytes
SHA-256: 2fc0ed12ff118287c036a5571552b0b60c211779a41e4d5ab85c7cdbeb87c132
font_01_sfnt_off0000d5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BF 17208 bytes
SHA-256: 988bbb0a0105c91c0187d00752ffcb3ff04846e90e8a5fcbb49e2332ae98e9d9
font_02_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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