Malicious PDF — malware analysis report

Static analysis result for SHA-256 a005cb4e3d112b9a…

MALICIOUS

PDF

77.1 KB Created: 2021-09-13 15:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 910a6576a58ca791ed1b87a9bb046047 SHA-1: 013b0f1378455816aa541748a77b726d956ecc01 SHA-256: a005cb4e3d112b9ab501b3ada382fd34f89337244925e3d4c83a729d6e2e4c38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting sites. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=fire+joker+slot PDF link annotation
    • http://millenium.moscowfashion.net/content/xuploadimages/file/47703727286.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/ribabepufawo.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/42259335699.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/67294433554.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/80483326613.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/bisofulofizelelitujemus.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/88258692698.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161328f6aa4047---55190430370.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/46261943287.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/rasujanulemurolusopukov.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/n26bbv8bjtb0gqhf8ch12h2146/27004793976.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/bofapa.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/24614575398.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/21580004621.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/foxalulawiwav.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/mamale.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/84032709806.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/mikokexajimivavafoba.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/jawarusomolemivanerulid.pdfIn PDF document text
    • http://zxsolar.com/d/files/65505283148.pdfIn PDF document text
    • http://lse.hu/userfiles/file/61755924262.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/11300365344.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/xikomojovuwajuzigaj.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bf34362a8---gasomodamupuxofedanar.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_off0000ca70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA70 17744 bytes
SHA-256: e7de5905684210a65c0e6d5d17b3232316171a9d043ed82efc0e01e3ed05b90b
font_01_sfnt_off0000f887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF887 10036 bytes
SHA-256: 4b7440159e336257d061106e83cee3ab3a54cad7c2ccc297683a927fad37285e
font_02_sfnt_off00010ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1