Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e331c437680300…

MALICIOUS

PDF

80.3 KB Created: 2021-09-16 05:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 452f3443ea459e288e273e166042fd5d SHA-1: d0a54abfe776649ba0535a481745afffe8bb098c SHA-256: 35e331c437680300b9cac3ce318c54d55c2bbd7e2ad2da509efcba696f57d0d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://archism.ru/uplcv?utm_term=war+robots+mod+apk+all+robots+unlocked PDF link annotation
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/fotexuwirexuxexuneleluki.pdfIn PDF document text
    • http://popmetre.com/news/files/95109499486.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/88899579416.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/50640822707.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/junekevexibogedik.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161407a2513ff6---66573915344.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/38059580455.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/dudabojim.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/510270840.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/gijobelitajugebisawete.pdfIn PDF document text
    • https://songhong.info/userfiles/file/10976890074.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/20633838390.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9a870ce629b73dd9098b721769b6ff5f/wabibojizobupuziwufil.pdfIn PDF document text
    • http://voijin.com/userfiles/files/ratisilebedajogepokekad.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f4cc30544---toxogapovudexanibopa.pdfIn PDF document text
    • https://cncunse.com/d/files/7160751199.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/kamabanetaxutix.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/39290028118.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/79675201040.pdfIn PDF document text
    • https://ocw.tw/uploads/files/vapefomuxaz.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/96165373796.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e439bfe2b7babefe4087e639e6bd683b/21423003154.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/sukidumesesofejafadaxokak.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_off0000d10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10E 10908 bytes
SHA-256: 7aab8ac595e6fdbedfa2640fc01ca2b9b369b0772f95d895297f7a20e4762f2a
font_01_sfnt_off0000ea21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA21 19036 bytes
SHA-256: 76dd1d035b62b3f7e5d088e568f564761b23e1f23195008ce879c7627d08a19e
font_02_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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