Malicious PDF — malware analysis report

Static analysis result for SHA-256 3830a4b452951d35…

MALICIOUS

PDF

95.0 KB Created: 2021-07-04 06:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8e03638474351e06b49c2b9f3d544d7a SHA-1: a936bd5a822b4a81356b7aba9f45d3ab3947561f SHA-256: 3830a4b452951d35edf3c966ca72965ffacffdbab953b309a0e2d2b478d9e31e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to potentially compromised WordPress sites and an IP address, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://stolizstekla.ru/userfiles/file/zijumobupemeratapusom.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3407494cc---puzobilemuduwelufan.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e86f55a1924c4b3fb5ccfa833445f3e8/4558186081.pdf
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/sojako.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ffb9ede93a5697f1afb3723d76c9397d/62733728847.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8rupe6jk8p33iut38g47sjac7q/xikulopasewo.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076552ceaf36---kimikosonodimobe.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68d4342a4c---37253554706.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d42642d856---tibubavulijekibomiviridon.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ipkar7t5sbf20kpijkdjoa26r0/fewofa.pdf
    • http://axiomestates.com/userfiles/file/33391285213.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16072c2cc01aa8---bowazubizugaxitojebofuf.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2cb1203f---robepazedawezumalebixite.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/11ba3f9b0f626cbce5d6d5328feabb82/kiwojivimejigip.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/657d55cdf82373bbd8688b4bd29ced2a/nomokileriwuri.pdf
    • http://centralgiving.com/media/userfiles/file/norosoguvipi.pdf
    • http://scamps.biz/userfiles/file/78864209761.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160be0841efafb---34388080866.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nn194lkujl6rht72rdm22a7n81/20196557042.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d1e0d4e3b471696a686f7974005ab069/xamovelesovosaxivag.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098afc278a6a---rinejefe.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/45612209808.pdf
    • http://accronline.com/userfiles/file/22922946022.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/7qfb4k7dug84ckd82p9m1njcs92il3uv/dojif.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=white+turquoise+metaphysical+properties
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f866.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 16792 bytes
font_01_sfnt_off00011077.bin
7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 16312 bytes
font_02_sfnt_off0001267e.bin
b799ac4a97fddbc5dcb77b2af29f2a51807e42a41861975bbfcb9862088da01c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1267E 17196 bytes
font_03_sfnt_off00015313.bin
256fc93b66f7847d6df1d9490402d3be0e42e87aa685212829dd8fa9e0ac5060		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15313 10888 bytes

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