Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cbd5125d82b50c…

MALICIOUS

PDF

94.9 KB Created: 2021-09-13 05:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b952c38269dc10d5031415227bdef7b0 SHA-1: 54d492d856c4facf5920b814830520ce93455db0 SHA-256: d6cbd5125d82b50c88870f277b938b99b526ce353fb1569c1cea4bb3a054f358
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to disposable hosting, a common tactic for distributing malware. ClamAV and ML classifiers flagged this file as malicious, indicating it's likely a phishing or trojan delivery mechanism. The presence of multiple external URIs and a link farm suggests an attempt to lure users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://yyfxsw.com/upload/files/latamatukorazawo.pdf
    • http://msdoubrava.cz/foto/images/file/72566371756.pdf
    • http://elcivan.com/admin/UserFiles/file/84816035415.pdf
    • http://fteq.ru/files/file/dimenajesitajape.pdf
    • http://otohyundaidanang.com/uploads/image/files/padozo.pdf
    • https://megatex.ua/images/uploads/file/93697340178.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/3edd0780fb83599d67e12d9431ed284d/rironidibukafa.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/b46dd6a7a237c2e7b9381332bb6b974c/bisosufemefun.pdf
    • https://shevian.com/images/file/11410415979.pdf
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/kezusatel.pdf
    • https://perfecthospitals.org/ckfinder/userfiles/files/93829653749.pdf
    • https://guapa2.com/admin/fck/file/46825950901.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139602f009e4---lejumutekokozitanej.pdf
    • https://hgindustrial.eu/userfiles/files/lifunokuwalozugagafa.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/zenarurejanejawamofakif.pdf
    • http://servmed.net/userfiles/file/50047987871.pdf
    • https://maribon.net/app/webroot/files/userfiles/files/giravidigalutujefolubi.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7c6fa1034c01cc751fe2a54eff53d899/tameraxi.pdf
    • https://durimawar.com/contents/files/vadidakovudaxuroje.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613157d7a8ee7---jaxuzasijasimofomisux.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/kubewudavovalibefojib.pdf
    • https://foundationkuzmanov.com/files/27727100169.pdf
    • https://protraderin.com/userfiles/file/62605400013.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=before+i+go+to+sleep+sj+watson+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c36.bin
41ea349748c524719f2ac4ed0c638948ffafd4202f6a9103065355c601d50586
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 18764 bytes
font_01_sfnt_off00013c8a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8A 16792 bytes
font_02_sfnt_off000154a1.bin
200202ccde0c41080bc8e5d8e31abad9e637bb55fbfa9b3b4aa61e37b1d45aed
pdf-font-stream PDF embedded font (sfnt) at offset 0x154A1 10944 bytes