Malicious PDF — malware analysis report

Static analysis result for SHA-256 8900cda46d86e6cf…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 00:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c340c5f513569e2f721699e9bac09e27 SHA-1: 3b3d311ea80833037be24c2b89a1ff685148d21c SHA-256: 8900cda46d86e6cfa5ae514db7f7be89927b5b8ff4e3548a8e3ed088721ff1b9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=grand+theft+auto+download+android', likely serve as lures for users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=grand+theft+auto+download+android PDF link annotation
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16140eb74c8c62---81691050007.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/marakepobusizonubomibekor.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/72968893342.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/30393609480.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/2581705681.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/33329214475.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xusakumi.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/14201854163.pdfIn PDF document text
    • https://egf.tw/test2/images/file/xopotari.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/gukokibodimota.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/kabokoxomifamopakirap.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/xogivew.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ddo7bmet74mtm0shk4lga612qq/tulenosisuzupimadiroza.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/kowapagerat.pdfIn PDF document text
    • http://odontotecnicacoop.it/userfiles/file/59092924651.pdfIn PDF document text
    • https://campermagazine.tv/public/file/47254328216.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/60997228872.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/towexevenifeno.pdfIn PDF document text
    • http://rapet.hu/files/duzovom.pdfIn PDF document text
    • https://mashura.co/userfiles/files/94892626755.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/34815350562.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/timepixetotujevufitoga.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/78100352034.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161408455d13c9---zaxanovotera.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/78603456124.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_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 17224 bytes
SHA-256: 4f2dcdf93e732bc29f99df4613b413bcd894c9c9124cc97792c0712805da0f7b
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 10508 bytes
SHA-256: 4e36ce03925304ad859332b5d14be1fe7f193676ecf060ad7d258ac30625d696
font_02_sfnt_off0001234f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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