Malicious PDF — malware analysis report

Static analysis result for SHA-256 2caa92b196dd0687…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 15:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff87a3169745e02615e6e35556cdc751 SHA-1: 92b13de0b5ee4e1b9eae364158576c9280cb6f98 SHA-256: 2caa92b196dd06872816d2656fe113dda8399a68d3bdaa113210cacbf7f00ec7
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://clumba-indoor.ru/files/files/tivofoxatib.pdf In PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1283ed15d8---lubatodapug.pdfIn PDF document text
    • https://webmenuplus.com/images/file/xosiwozimudebusalilesewe.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b66eeaa927---32171670000.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/74100015580.pdfIn PDF document text
    • https://menu2uplus.com/images/file/50701013327.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/liveguxog.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611bb42bdaa68---rudilujebezilibes.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/kasutuxami.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/4aaf2dba525d8e828b6679f4be7c1259/9260973767.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/xevizipijisorilanulolepat.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jd3616shdf0i1asojnvrtj79m5/49594527901.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/j247amnbqe0sdlkrj4r7fbui33/ruseg.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/7014450049.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/31978386844.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/xusegu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608822fb1b28f---zukoxujurozedapozisodor.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/duzibugimaxigafijafuwu.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e0de0363df5---63923819609.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/vipekamikigoxunafowu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073a567e0965---rilolunaleluzunokomegapo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c7acda718f7---59141789137.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/44737508675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=fazoli%27s+application+pdfPDF 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_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 17888 bytes
SHA-256: 907ab9f598bcef542c4459cd5a4e8addc94c53ac119940cad7edf4b734822eb5
font_01_sfnt_off000107e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFB 10452 bytes
SHA-256: 61ecc841752e3c4961ea59f265b51e6ce47ea07b3abe5ea3d643eb24ffefa0ee