Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd26c416ef1c4eb0…

MALICIOUS

PDF

80.6 KB Created: 2021-09-24 01:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c11137e2182a93c378d17090f7e860d0 SHA-1: 1bd72b5a3054e7681998162f8f68218c67ef9b6b SHA-256: dd26c416ef1c4eb0b8c5d2ed1fff2259a2e337834bf13f8c62a3b0df9128fe14
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs, some pointing to compromised CMS upload storage, and others on disposable hosting. The embedded URLs suggest a lure for potentially unwanted content or phishing, as indicated by the 'utm_term' parameter in one URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=pokemon+omega+ruby+download+3ds+rom PDF link annotation
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/34148214002.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe40d234bb---68854693919.pdfIn PDF document text
    • http://jucal.es/images/file/15468287464.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/21451892311.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/64988116211.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/9809304021.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/favaxaliwesipuzadal.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145af8f7c4b0---tafedadi.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/80611216459.pdfIn PDF document text
    • http://konberdbio.com/upload/files/xarawagojiwe.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/51891637580.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/6317922028.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/wejogukelejol.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/tukamawiwasivupisafetobit.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/ratuvefadexokoninex.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/23767937178.pdfIn PDF document text
    • http://talleresjpg.es/img/file/13385590532.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/larudafopi.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/88582765297.pdfIn PDF document text
    • https://orrizon.ru/images/file/zafagijiduxaromitoj.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/c141qgqcc8f37j7u0cote90cu8/xudobibetijogijezib.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/lefifukeze.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_off0000d38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD38A 18320 bytes
SHA-256: 6a89d0a53f11c279b5ec132316e7d1ba40d38fe87a6a54c1b13fb7b8eb292d5e
font_01_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 11104 bytes
SHA-256: ec39ec75ae5fda16f7c15857a7717be0cfac423cce7f92e6640d6fa6b7baaf38
font_02_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1