Malicious PDF — malware analysis report

Static analysis result for SHA-256 336d781022663fdf…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 16:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8671346e2b50a80a1311f924f7ee57b9 SHA-1: 852ede75f1b3bdab5bd2c786f75638c664bd18c8 SHA-256: 336d781022663fdfbb0bb54af22e0878c25cb5e9f547bedd5c52c14d6db5b399
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9vo1os4jrin5a23381q9ojso44/98733579633.pdf In PDF document text
    • https://kaptenhoki.info/contents//files/wurasedezubiwowabakoxus.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f8623a3c321---tetajetiposaw.pdfIn PDF document text
    • http://samtekelektrik.com/files/worezavolubizodepijefi.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/mumawerowukasunezinaja.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/gogibitipujotub.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/73723113879.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/66028b6f6589560702c6f736c7904ebf/tisuxapepeginun.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/gokuj.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/31269402253.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7be61c05---6417010960.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/93925100465.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/zerupebafodajegew.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/99359928803.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/61306631204.pdfIn PDF document text
    • http://castanienfamily.com/clients/74558/File/61312066993.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/46646046961.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/zejazi.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/26492046625.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/53b648f00048d1ebc142c6ea349aafb5/91680941710.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/pogupanizijebevuj.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/4181334065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=compound+nouns+worksheet+grade+6+pdfPDF 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_off0000db74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB74 17484 bytes
SHA-256: c8c59d2342b6d2b9314b14c32533f6bb24dc4353c39b3f7b879a473509af70da
font_01_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 11284 bytes
SHA-256: b0e796340203c361efa1d10e0b13927e734d92d61b6ddc56f72e609e256b558b
font_02_sfnt_off000122da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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