Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ab9dab62b91172…

MALICIOUS

PDF

88.3 KB Created: 2021-08-11 13:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 868ecd5616f6cfedf16e13f993a5c606 SHA-1: e837fe029cdf32e251ae6b50ac2b52a32f4f0fc8 SHA-256: 34ab9dab62b9117286e20d406e774c122eba94dd499bff0c0fe6fc497621bff3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's used as a lure, likely to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://kimyasaldubeller.com/upload/ckfinder/files/negari.pdf In PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/84831776774.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/90270611038.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa7f618be---gusarar.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/buzegugezuromowopilap.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/jizozapikavilovigij.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/8399546629.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/be828aa3498cabf3561ab7d6c8929e74/vilek.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/pekubabinidumebebudaranon.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/3189314132.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/lowodavisiwurifesi.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/65728503385.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/folijufixoxaxonivaxedefuw.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987f0e2793c---zasuxuzafabotobas.pdfIn PDF document text
    • http://voijin.com/userfiles/files/82889132561.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/1a6fd69ae193564d89e7e8583e10fdfb/gapobid.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/wozerimilalef.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609439af6c87a---83468971196.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b378d185d6---fagape.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/77547754095.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/afbc3a185c342f3eb6083bc30c410d41/basijovumesimuxu.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae89a95407f---xevufofofegevudozunesag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=dagger+build+albion+onlinePDF 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_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4A 17616 bytes
SHA-256: 5014de78b019a1e747681901064bfa13f447c3a7fa6e0822875797094105df89
font_02_sfnt_off00013cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCA 10400 bytes
SHA-256: 5ed5ef7be6aad3d828734f7aa4ad98fba4399d13640d41d1d75b59d90f02fa4b

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