Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6341d4db3befa3…

MALICIOUS

PDF

85.7 KB Created: 2021-06-23 04:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 54236635565657c9852800dd322a5d85 SHA-1: 2a992c13620ac730f798e0eec61227901b5b5438 SHA-256: ad6341d4db3befa3a70673d7898b73306c9af1f316c614bf7d39cecaea024ccd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The document body, though obfuscated, appears to be a lure for 'reading passage answers', a common pretext for such attacks. No scripts were extracted, but the presence of numerous external links and the overall heuristic profile strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://infrive.ru/uplcv?utm_term=reading+passage+2+making+every+drop+count+answers PDF link annotation
    • http://iccj.jp/images/uploads/fckeditor/file/xamexofomo.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160942cc348374---riralewumolirol.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6o015b51r269j2gp61leadjvej/45505532275.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef7e78bc7a---mugedexezidike.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/12821324009.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/94201864343.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/45537990963.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/94c40dc302b5528a5e827056490803a1/857327332.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5d6ea9ps48v6sjt6q3qkgbcpp0/sugatujefuserunelajudewo.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/2qel580a2hbpp73kvph35lq53p/sikozizu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cd488682e---7648822065.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/97924730418.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/67363980784.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/12730348658.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/ce1a9dc8f337fe925cf0068a2c38e725/5973499395.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/potaneli.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078b990ca686---pelimifotikinigitulogado.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/788b3c70a8aeb11e66499630dfbb3966/verefeve.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6C 5700 bytes
SHA-256: 12ce1dd83f226154fc1dc5b927266286e55bc07a20e3c96086a5f5a463e4249a
font_01_sfnt_off0000f1d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D1 22828 bytes
SHA-256: efa35ae3fa7e1bbcd3a8771ff23c972bc1ea9deb75f850c412e52ce5b0cdcfeb
font_02_sfnt_off00012391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12391 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off000138bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138BF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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