Malicious PDF — malware analysis report

Static analysis result for SHA-256 653f3603b7fd618f…

MALICIOUS

PDF

67.8 KB Created: 2021-05-07 01:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d0632471e88423e591f7674c1013443 SHA-1: 1b3275581626f542f587a98d42fe4159072ff172 SHA-256: 653f3603b7fd618f7c2597ae284f87df527a835eb4c09db9de2d57a31794e13c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards the exploitation of PDF vulnerabilities or social engineering to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.aqsclimited.com/EditorImages/file/bulaparetefofikanozisi.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f0c1c83d3---wilulalefiw.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc27554b72---dilivufafixuvem.pdf
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/3f036e43b3b782489f731be68eafe825/78297434322.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9136b3481---13010303932.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/4fj0e2199o1gjff4tf16iejis0/68154513886.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609459d9a611c---putanafuzojonalugatuw.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160851e3cb2772---vozisalozegimotuweniwosex.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce02860b3a---628711304.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081c12477e76---gesijufanefinamep.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/tv84q6viuiaihvpitibt9io1vl/69918335487.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ahj4s6gl8cdc97vn70uqcvhs04/jawesuvobidobinux.pdf
    • https://alnahamgroup.com/userfiles/file/benaz.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609145ae7a2c5---33254130676.pdf
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7d46cd5a4---tijomadisabososijubikone.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/hq2j6v78p1itrthfm2seqm8054/80865236012.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160855c3346d44---27716418310.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=blush+maxi+dress+formal
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfe7.bin
05a304c604a5e78858097e9dacfdd3cbf966f3e9484cb52e8b59d69dae85af9b
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE7 5264 bytes
font_01_sfnt_off0000e1a0.bin
ba5f62234ba5f93f34ffb3313f9c9921f7679747340f0248fe2aec965e43e336
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 9672 bytes