Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb5c52686f12879f…

MALICIOUS

PDF

81.9 KB Created: 2021-08-08 10:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94d467d8d241cd67d5356561a11db087 SHA-1: 21ee21df7f405bff9d0ff32fcae8982bd5fa16be SHA-256: eb5c52686f12879f0177862580121bdecc111a3cc87b94b4a2ac42b40e9b5efe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external URIs and is described as a link farm, with many links pointing to compromised WordPress upload storage. The primary purpose appears to be redirecting users to potentially malicious or phishing content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=the+complete+idiot%27s+guide+to+music+theory+review
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c755a8bf15---gusefodedalivosufege.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c496d65ffe---12358319662.pdf
    • https://ozmutludokum.com/userfiles/file/kasowarorifutedejofewum.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d18ea70f614---xosibiwanoz.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7f7d93266---bekikamiruf.pdf
    • https://maconlux.ovh/userfiles/files/xalebivixupedokukofubimin.pdf
    • https://pmsp-me.com/userfiles/files/palabazidafijepejodevar.pdf
    • http://www.salac.cz/ckfinder/userfiles/files/64832528363.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bf85a3241---repatod.pdf
    • http://niezapominajkowo.eu/userfiles/file/fepajaromororax.pdf
    • https://asiquim.com/ckfinder/userfiles/files/17836055313.pdf
    • http://fabienneblavier.be/upload/files/54621260238.pdf
    • http://preciz.com/uploads/wysiwyg/files/57323905654.pdf
    • http://asckhn.com/acskhn/userfiles/file/47898688160.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f6f0c63a---47718123613.pdf
    • http://solmoda.it/userfiles/files/8131063139.pdf
    • https://sunarchegypt.com/userfiles/file/zutama.pdf
    • http://extracam.es/app/webroot/arxius/file/28574824279.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/qp58s52178bka6mm206l9vrdlf/7544517901.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/q34bl2v2mrb3ulgs8m2fq52pca/firumuwoxomonegewibixo.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ll8n2b467q4hl3std16qgg7150/48508999047.pdf
    • http://infoegrafica.com/userfiles/files/42480686046.pdf
    • https://akproauto.com/nbloom/fckuploads/file/fopiwubirijatabenaxesiv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAD 16792 bytes
font_01_sfnt_off0000f3c4.bin
eedfefb779bca2fd02153da0d843ecf17f46ab088b5b6b1f2855069fcf9e0e14
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 11056 bytes
font_02_sfnt_off00010d66.bin
55f8ce75f5ae6cff80008551ab7956c3ec5435bd59f93e9d3cc64d36cb8355e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 17168 bytes