Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece4b7887dec0cad…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 08:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29eacd4218bb20778919ef8d2fddcde4 SHA-1: ce1ca9f992b9713c75abb2271399a70d48bb9272 SHA-256: ece4b7887dec0cadf866d0a15126c67d3b09953397774b7cd809accc4544491d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Numerous embedded URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to phishing or malware-hosting pages. The PDF structure itself is heavily obfuscated, and while no scripts were explicitly extracted, the heuristic firings strongly indicate a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://catamma.ru/uplcv?utm_term=clean+up+scanned+pdf+online+free PDF link annotation
    • http://kokocurry.gm/userfiles/file/105604203.pdfIn PDF document text
    • http://artattack-concerts.de//files/file/lakerevowinojujajipifov.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/pazelolo.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a81668bfa2b2f553cef6faaf5ad05ade/porijusinesikamelexas.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/lilowilopolatad.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778f91004a9---nabovatumukopogiz.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a78e6a54dd7---subit.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/71051669402.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/17020332315.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93975c0679---68968017392.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16121b56476466---jolewefakako.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/s7g3skrcdtee13brvmd10ji16e/47700804158.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/uckobbsa91f0n2cbltokfgmt4l/67364865590.pdfIn PDF document text
    • http://parentini.it/userfiles/files/14905855344.pdfIn PDF document text
    • https://starbox.fr/img/files/xiperixopomiredoxuw.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/kanixofuxixolusidomo.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/57444982686.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/muxedibefamejogixubi.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/butevuwonut.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16126bd911b844---19716252554.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/mdlq06jsfh0vlfbguki4339uhs/tudasikoketo.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_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 18036 bytes
SHA-256: f2151b438035d2e0d4be32e651fc952078a2cf0a328aefd0d262f1a4a721d2a9
font_02_sfnt_off00011f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F92 10648 bytes
SHA-256: 77aef5a40f2e1bec785b2032f8a03b0fd2f16cdc0476ad36e04cdfb698f7a64e

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