Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5a516d300f861f…

MALICIOUS

PDF

99.5 KB Created: 2021-08-16 02:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a3d23f5a6e06527deb297ec378ee683 SHA-1: 2aa22ca48d507bab9eb5917e5489f3784291e889 SHA-256: 5f5a516d300f861f9aeff63e19d81697eb3dbf20a34ad4b7c36e363e96c85a3f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The PDF structure and link farm heuristics indicate an attempt to redirect users to potentially harmful content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac0022c650---35702029690.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/7drtsa8od7mjj1rqkeodbrsvrn/xegisozujikoxa.pdf
    • http://chrisdepanneservices.com/Sites/cds/files/77567900453.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/06bce3bc870a11d575cf18cc31ec88f5/napamijefenokem.pdf
    • https://veterinarycarefoundation.org/userfiles/file/rapaluja.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/pobiregik.pdf
    • https://skinrepublic.vn/webroot/img/files/60047034839.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f5034006a252656b4b5a8b62a39a518f/51857322212.pdf
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/nipesopabifidakidagid.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a130845e999---labaxuxoki.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1f776b52e---95076963348.pdf
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/kexujuwix.pdf
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16220646360864.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/e1t1lou0b6pab317kaelf9l2n0/jezovufibukoxemiwakuvep.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf496b1a8f---3174671456.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161100b5149836---fumijibuko.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/52dd85cc76b8ebc18a89121b2dccb38d/64467184074.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/85238506836.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c551aec3a---raxunisumaxikuxo.pdf
    • https://edubox.mn/uploads/users/0/files/69484584539.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/85c3061fbca0cb04f660041508ae34ea/birazunozefaza.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094d01314831---46786204204.pdf
    • http://sklepjola.pl/userfiles/file/dowulamemibaluwefuxi.pdf
    • http://agriturismolionsfarm.it/userfiles/files/33573184631.pdf
    • http://chono.mn/uploads/userfiles/files/zosovu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+intermolecular+forces+are+in+acetone
    • 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_off00011fb6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB6 16792 bytes
font_01_sfnt_off000137cd.bin
38852a1cc2bf015abcaac978a78c4a3e30944da26b2a22e92bbadedaf77c6de6
pdf-font-stream PDF embedded font (sfnt) at offset 0x137CD 10692 bytes
font_02_sfnt_off00015027.bin
fe1123393e29a45fa1a1ca75eebe2bc9e2a9c945c88ff5e17ab99549b0493f05
pdf-font-stream PDF embedded font (sfnt) at offset 0x15027 17960 bytes