Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb89494f589a5c2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 05:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1d47a26e21dcda465137d2247add667a SHA-1: 4e929b062cc7c6ea06b1b6640a51b00975f03a0f SHA-256: 3cb89494f589a5c2e030b7913620b93a7f19fd03549d77feb2b5be3801158ee1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://renesens21.com/ressources/upload/files/vebunelirap.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7fb2c6fcd---goleliropevururijakivi.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/100cb87b7bd6f5c047a05a043c335686/94867371699.pdf
    • https://burstallconrad.com/editor_files/file/misozipi.pdf
    • https://adikketiga.com/contents/files/kijufa.pdf
    • https://irantruck.ir/data/file/21693735892.pdf
    • http://thetsaban3watnuea.com/UserFiles/file/gisusakemowaj.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/65048e9ceb937a13adb1ec97186c4ef2/42599848510.pdf
    • http://tfforming.ru/d/files/soxuwoniralivenewese.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/cutfp7qkamtd2m4b8va3jj2050/29852356302.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/71778759717.pdf
    • http://valeneighbors.com/userimages/2356249437.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160816b131015b---47150641453.pdf
    • https://dock-levellers.com/upload/files/63727944400.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba06e146087---72487130543.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/ba02e56736aff8fa2eff2c5239c7acb1/baxewegupana.pdf
    • http://medicaldistri.com/ckfinder_files/files/fevaxeluz.pdf
    • http://packamate.com/userfiles/kivifevenugu.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca05e9f437---26799536091.pdf
    • https://elmawadah.com/userfiles/file/pifug.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/pujupokokax.pdf
    • https://alate.org/admin/fckeditor/editorfile/22016922125.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d924944e2e---kufiga.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe86852da0---25785879320.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=civil+service+examination+reviewer+2019+pdf
    • 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_off0000d848.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD848 16792 bytes
font_01_sfnt_off0000f05a.bin
61210a27750a190314bcb17b9bf6df09653693db49d8a07336b2883a5527d9a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF05A 17764 bytes
font_02_sfnt_off00011e61.bin
62a2f7ba5f1601897ec6dbffee7fbbccb342aeb9435570faa0ce3a43e86182a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E61 11528 bytes