Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bc1adfe8e451698…

MALICIOUS

PDF

107.5 KB Created: 2021-07-01 09:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: b631a971da1bb8fe435564fffe7d56bd SHA-1: ddff3078874bd728b01747cf74f6fcaa004cf7d2 SHA-256: 7bc1adfe8e4516984d6315baa68c909ef6eea7c2ee8709ffd3ad6d17d64975d0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/udas9jlc5rpqkv97cb6mvcbacu4ronap/37397063971.pdf In PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a7890b688e3204e69851a68c344abee7/gitagadalukuledasuzoweza.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/5538089802.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/5dh9ceklrk2jacic6npha4r05r/89619320929.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7vqked75ags6gd269lj9sipch1/31723407163.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/85701312961.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/79774273354.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9e2bcefdd---35840617772.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a04e72eb56c---savepidarov.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59dc93d35---33227088380.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/u7e63k5op0dka64u9nfo6hgf11/nofupotenodirokofopuju.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/52892005997.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/ruvanutemalebe.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/40035116656.pdfIn PDF document text
    • http://ozari-ua.com/files/file/movawonu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d086903ed---bivuzuz.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/25826006935.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-26/20210626150645111797.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/32805872802.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d29d43c0b---fififutumukujujagivesado.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/mrjitsd7gbemgmljsavo4jbn76/zeziko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=eye+of+ra+meaningPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14377 10340 bytes
SHA-256: 9d6c92984dac841aa72257620e9a2b0b75c5326ba038c81f825614243cfc375e
font_01_sfnt_off00015ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AC0 18240 bytes
SHA-256: a535bf24f7579fb24a939bcd7ef11a9a689a15d97ef5f5b3fb4a29bd01fd097c
font_02_sfnt_off00018901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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