Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d778cd4e644132…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 19:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a1122eeab5ad510c15e2b53d9c6753a8 SHA-1: ef9d6afc6689add5e60b949cf42d17b187dc821e SHA-256: c7d778cd4e644132d5b364b6ee05595e972abed7592219ea6296766d11250cbd
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm or redirection scheme. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4tq7hq3oa0ujvk11fovn97c487/13812669279.pdf In PDF document text
    • http://xinyuemu.net/assets/202108/files/20210826083644327709.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/jogujagipasebopuka.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/fojevik.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8eaf5c631---30417044069.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c955760918---ruxikegobejimezawij.pdfIn PDF document text
    • http://retailcop.ca/files/81147302536.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/98207349137.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/lonuroritarofunaronituvi.pdfIn PDF document text
    • http://happy-land.hu/editor_up/31805159297.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/9hf77rk7jb998m2kpj88hmt9t6/tajupajil.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/96487002304.pdfIn PDF document text
    • http://ruishikaishi.com/upload/content/files/2021/06/20210612142714.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/tozatutinuxugigese.pdfIn PDF document text
    • https://clinicscrm.com/img/files/20778094166.pdfIn PDF document text
    • http://yalciniskele.com/imgup/file/samudeledupigudaxagopor.pdfIn PDF document text
    • http://tele-video.ru/upload/files/61061680516.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/34524049438.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a586a62522---18135626754.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/84527216688.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/tezojametonewudilorozoxo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/s7cdetj5jp7g7gjdjco11shs60/33718495822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=add+new+worksheet+in+excel+c%23PDF link annotation
    • 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_off0000e1b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B2 10564 bytes
SHA-256: c66c76fcde32dbd4a2f1659df73cbac85e5de255bcde899c106390f97b476996
font_01_sfnt_off0000f9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 17212 bytes
SHA-256: 74a975199db903ddf77cc41a66c30c44fabe83ccfa1d7aaa94008c6e9008605d
font_02_sfnt_off000126cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1