Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31c0b316b7ec989…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 19:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 975e0ffdbb29338c29181828b76cbf8f SHA-1: 500ed2de2c4dfed23eb8b687ae5f6ffb725c4055 SHA-256: c31c0b316b7ec989dc3b982ad86fe1274a97e9ad37f4ff1caac461b8dca7ad63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest a phishing or malware distribution intent. The document body itself is heavily obfuscated and appears to contain some of the URLs, further supporting the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=go+go+elite+traveller+lx+manual PDF link annotation
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/2fao1i6pmmebjdje9g4fte7mqo/vebozadijanu.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/01bdcdf001e4d68feb16e09a5c2d2b58/vutemifapeguwawozedutoj.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/38ee5698dacebe9faf9476e2650c9400/56468874957.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/sikagavomaki.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/acf4ca27ccc6045564ef743ecb8fc767/wufilojepakonovunipabaret.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608288f6e8c2d---36207505897.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/f58c3d594239f716adc50cc5867295b1/96299459189.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/28660654644.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/30006883364.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5fccb13bf---fedawinupabekudune.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/51375908220.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210629011844.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/lopojezuzelimobotaxekelif.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/eff9de075e4c12852b9e1cf3b19cab3c/61958649973.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/30862755ddd81437fa6f12cebd2558c7/vojodonu.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd9d00aec9---46117140445.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/71e22475c7fc8fed91f0e521ac537f0d/dafodamufunid.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d4a3876ba7f3f1c6f4ee8b394f765373/polajafamogaganodizudus.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608245de2a460---bukigigojaxeduloko.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/bodikiwiw.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/5302014803.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/44463171861.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/28907471750.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_off0000b9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F6 17680 bytes
SHA-256: 673078b3da29bcad2fb74ebae521eac52f669b4027f32a88f931dcbbce19e86f
font_02_sfnt_off0001000d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 10592 bytes
SHA-256: 409a19c412a0edd8501bffd78d051522031a42b631a5047d96f357fb386248ef

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