Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf9bb8f351b4bc1…

MALICIOUS

PDF

99.9 KB Created: 2021-08-23 15:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6e282e6fe8a99410a4e208ad4bcb6e7e SHA-1: 77b167a147063e409fb7b7325a0fa64e022971ea SHA-256: 7bf9bb8f351b4bc1cf3586a53ca05e1d64e891a9104adca5b7cba23a733a8087
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded links are consistent with a tactic to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/56n8kansq5uujgqe222qijtvfb/5466491495.pdf In PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d12005b65ac7044ff867ca80afa3ac8b/muwewugimipimukaxeg.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/22684703254.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/rovokebuluno.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/76313127366.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f41bf06c6---rufabogeso.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f85491bad---11554880907.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbc3bf79ccd---2233740869.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/wetiniwatezawefi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7bec08467---81672644576.pdfIn PDF document text
    • http://tms-operation.com/upload/files/82449418306.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/8c79e1702f59ae876a4010d28f9c69a8/sesiwar.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/bafazaxelobuzozokodor.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd28b0edca---xemokoluxeli.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/19496727315.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/bbebe391009ea36c6815694c3214a97b/surewopodim.pdfIn PDF document text
    • http://kbchina.de/upload/32818256541.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/ebf3486ec240997d18ad6793200bd2a1/gunukuxex.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f2a5699ca---liruzorakufojogunox.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/73377990877.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/76274124954.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/dunadenigonilovoxijupu.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/47988675465.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88848867191.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081846733317---tafaburumowibavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=solvent+cleaners+are+often+calledPDF 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_off00012809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14020 10516 bytes
SHA-256: a6b2509022de5c2a8d68b0c9ff45023a8017d624fb9d6c2e002eba4b883bca50
font_02_sfnt_off0001583d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1583D 16128 bytes
SHA-256: aa08d89550213eb7f0da85ffe14bdef10bd050e04fbee2b298d343619ede5f41

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