Malicious PDF — malware analysis report

Static analysis result for SHA-256 8de188521c90c8fb…

MALICIOUS

PDF

76.5 KB Created: 2021-10-07 23:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4c40260b434eb640c335d6b86a7d9378 SHA-1: 9e952b7ccaae858804e8b4049b1fbf5fdc4d6d4a SHA-256: 8de188521c90c8fbb977984c848126ee4649dbae3fec4fee22334505d4f7ea4a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised CMS platforms or utilize disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://eros-arena.de/eros/userfiles/file/74507504985.pdf In PDF document text
    • https://stef-nancy.fr/upload/document/34377717373.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202196455397806.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/fubav.pdfIn PDF document text
    • http://compsult.net/userfiles/file/wuxiferomon.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/bebimokefororovemoje.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/lerisirura.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/tuzonoxepow.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/55792117815.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161463a59da5d3---798946446.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43add112a---luzakuvi.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210930220357.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/19323965889.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/nenakuvenedepuvakupof.pdfIn PDF document text
    • http://analhospital.net/file/files/35452870084.pdfIn PDF document text
    • https://tekmaker.com/upload/files/muwupomerumon.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/53735736604.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/717892678.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/vtfhjvt1hj01mdk2pvpi1l5n57/58650010733.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/danuvivimugobatonamu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407572ac0ed---mebawegimo.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/tarujizomugat.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/tuvovimazugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=homosexuality+abomination+biblePDF 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_off0000c770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 10616 bytes
SHA-256: d0698033c8bfd291d2fffe10e6b597b9b66e966c27933bcdbb39cdf8a29b03c9
font_02_sfnt_off0000f7ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CA 17488 bytes
SHA-256: 9fc296824f88edcfc72446215b89e32f00baea941f2e460594435e0abe38034e