Malicious PDF — malware analysis report

Static analysis result for SHA-256 27aceb66e946495b…

MALICIOUS

PDF

87.5 KB Created: 2021-09-15 17:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2dac52b10d73ac8b685304b09d140c96 SHA-1: 3adb183b25e4e0b70f0edf43c509fb6cd01387ab SHA-256: 27aceb66e946495b2bf60139dd9e575af03433a30bb539aae4f44295ea87261c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these indicate attempts to obscure the true destination or leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://malashealthcare.com/userfiles/files/92240075935.pdf In PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6f7960751ae36c1b39db035580f4a1e3/81502975473.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/684510495613c36981237e.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/96439860896.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/73133127512.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/gogisev.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109010652178491.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/nenuzojajo.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-13/20210913133233564142.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/38405661754.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/lewaxolixatal.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138342bb3361---13688442806.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/wilalofewo.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/tovugekewalumove.pdfIn PDF document text
    • http://lscapital.it/images/file/63117077289.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136689217ffb---31524662096.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614092cc096bd---midojodiwisiw.pdfIn PDF document text
    • https://unaizahic.com/Files/files/dijozufate.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/kitafiko.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/33961372893.pdfIn PDF document text
    • http://delve-cr.com/uploads/15299614914.pdfIn PDF document text
    • http://freeorden.com/media/file/63459317201.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/48532547170.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/eqvq3fspucd15mietr625on4v3/bixef.pdfIn PDF document text
    • http://anpo.vn/upload/files/69264522982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=app+for+retrieving+deleted+photosPDF 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_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 17932 bytes
SHA-256: 52c1b8dab6e085d838bf5cc52f4642444b13ffdf4b0e51152680e01fef87be49
font_01_sfnt_off00011f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F94 10660 bytes
SHA-256: 1db7d7c7f28f1434ad961da8b72cbbac8357beea1e56efd0ce687caff3a01a5c
font_02_sfnt_off000137bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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