Malicious PDF — malware analysis report

Static analysis result for SHA-256 4374289e50ee09a0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 23:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d821410ddcc6626b36ebca7cefe1cb7 SHA-1: c3fd70b56aa65f8c8c25ec602991da8f46662fe2 SHA-256: 4374289e50ee09a07dd820da4f133100c8c61b8bf2cb37fe1c7a994fde750341
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple disposable hosting sites, suggesting an attempt to distribute malicious content or phish for information. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://carzip.biz/files/uploads/files/88124237812.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e83379e2---rawuxisidap.pdf
    • http://fujavietnam.com/images/Download/soruzujewap.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613d854952688---89669529582.pdf
    • https://liantoong.com/archive/upload/files/gexaneduminifixozam.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/k45grt2ek8kk64i8oa3lr0lgf4/35594395365.pdf
    • https://titishop.co/upload/files/rixajawifitelulot.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161339a0a00f5d---kejalubilazedokilin.pdf
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/zaxedusababifipopasen.pdf
    • http://commune-bourre.com/userfiles/file/minopof.pdf
    • http://coachhouse.info/assets/file/41145064894.pdf
    • http://smwiarus.pl/ckfinder/userfiles/files/78587731525.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613927ddbdd7f---pejimikokapar.pdf
    • https://starfoil-mail.nl/uploads/wysiwyg/bewejibaxononuxefi.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/6158be624bcefa3ad34a00bba6473db0/12744986543.pdf
    • http://pataibicaj.hu/userfiles/file/94041896637.pdf
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/biwakopi.pdf
    • http://lindendirect.com/ckfinder/userfiles/files/96930194183.pdf
    • http://cyklo-sport-servis.cz/UserFiles/File/46957332276.pdf
    • http://tochalco.com/uploads/files/gewuvudedejumipotasebina.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341b72e1be7---fonumanaxusomu.pdf
    • http://doudou.tw/userfiles/files/fusopaturewugiselafuwikav.pdf
    • http://business-baltic.com/myfiles/dok/9697162506.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=project+igi+2+game+for+android+free+download+apk
    • 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_off0000da93.bin
5c5c7b6ca408188d4dcf093a90bec249e8f23fe5ebae1fc62dcf75e80a6a87f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 21512 bytes
font_01_sfnt_off0001124b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 16792 bytes
font_02_sfnt_off00012a62.bin
b38c4d845f43587f0fa0fcb06e9a1b45b64ba27b66c6ebe5463a848e7c97521c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A62 11224 bytes