Malicious PDF — malware analysis report

Static analysis result for SHA-256 935b2dba9ac60b4f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-25 19:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df85ab5b6128f18f923d18e992bac3da SHA-1: 20930a9c51dbf9a0eaebe25047afd6d9ff79ad17 SHA-256: 935b2dba9ac60b4fc11a3587dae8a28900908fae098055c2ba8d6ce96e71dd86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://garglob.ru/uplcv?utm_term=wrc+8+apk PDF link annotation
    • http://animalscipublisher.com/files/upfiles/file/93434572893.pdfIn PDF document text
    • https://saglamahsapkutu.com/img/editor/image/file/vegodo.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1632497657671467143.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/25238656066.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/63367241242.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/17049308733.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/tugojag.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/036b9a9bddda8741f2e9466465b72611/75587970661.pdfIn PDF document text
    • http://salt17.com/userfiles/files/10614133234.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16148a56ad419e---34932901929.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/70143034681.pdfIn PDF document text
    • http://metabolit.ru/files/file/kuxepatakutifule.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8162439fb702f79be99c258604f69495/87584588254.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/65111041399.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/90428096600.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c4cb07b8d2---98921678898.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/sozonad.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/kelimurulupofe.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/tulapi.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/98499297662.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/rigukixopa.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/galubot.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/djspn9o0o6t2eld8o2kqpp87j0/xafetozojopawufad.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/17868757727.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_off0000b5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F7 9900 bytes
SHA-256: 6007bac2b97c28e7b7371f25fe8b5e135e3bca819a095b7656fb8ddd31a63562
font_01_sfnt_off0000cbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF3 18552 bytes
SHA-256: 00d27602e010f39ac62d52dbc45b31f5cd4f92c095c3040149b1fa57a66caca1
font_02_sfnt_off0000fb20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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