Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ea039ff7aa73e0f…

MALICIOUS

PDF

102.4 KB Created: 2021-07-04 14:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a4f0cbbc030807a2bd4c7c14e5d21fd0 SHA-1: f8373e0f0e4c3aec61ce5171c82aa80b0ce802e4 SHA-256: 9ea039ff7aa73e0f8ddb009e1ef7e43afa4fc6429482a76360036fe6f4884611
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The primary purpose seems to be redirecting users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607d709a9bcb0---31410795154.pdf
    • http://vetranhtuong.info/luutru/files/rovexas.pdf
    • http://ncdesign.it/userfiles/files/7131752834.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/hla9koda4jvdhaksudqr9i8gv1/rozoralewi.pdf
    • https://2acontractor.it/images/file/6779192242.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/6542450cfe1f0e3e58db9f650a564980/lakotowinebuguzemub.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d8d53ae156a7756ea1f5a499a8f964d7/57297014333.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afd53090070---juxumizilidulawa.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/2de57212819rcl9o4m9pp50p3r/kavubijilajeso.pdf
    • https://stef-nancy.fr/upload/document/desipabubibonadure.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a981b61197f---vutikusurugurulapolebonut.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/6c7bb90c282e7bf37b94a154c615cbbe/gunoginefepotuvozobalev.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/486a3cd2eb603d2f27b7c62b65f502e1/bapadusud.pdf
    • http://daiichilogistics.com/uploads/news_file/pogimibamejajilajoko.pdf
    • http://ldbell1965.net/clients/85689/File/zoxax.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/770e0052f80d1e4ba7df9d6bedc2cdd6/xesojonepilujozikesilida.pdf
    • https://netiko.ge/img/Data/file/fugowe.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeed4613ae---fozewanalomulegopatup.pdf
    • https://embassyinvietnam.com/webroot/img/files/2116556407.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac812194878---10321463066.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/5d7a1b904446469e7a9ac4925717faee/34681672578.pdf
    • http://accessprecision.com/userfiles/file/rivugarudanusurawo.pdf
    • http://yaqeen-eg.com/userfiles/file/kidinibureb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=properties+of+3d+shapes+answers
    • 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_off00012acb.bin
3ec2a194f64365cfb3c596f07fe0dfd672a28f4928aa028ca81f9f6ff5463f46
pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACB 18528 bytes
font_01_sfnt_off00015b44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B44 16792 bytes
font_02_sfnt_off0001735b.bin
46c626a7bd7d582389617b5b8c970e7d6d0fb013d3bafe9c74878a66a4fdbce0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1735B 10808 bytes