Malicious PDF — malware analysis report

Static analysis result for SHA-256 653e0d7c8c12d19d…

MALICIOUS

PDF

80.8 KB Created: 2021-10-11 02:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ddebcacb1fc691a02006c96a4f638ffb SHA-1: 1f9eeda918a6db5271bccf18dd101083d0d82781 SHA-256: 653e0d7c8c12d19d79e434d0edd1690dcd39ed8405a8299faf0b2bb14bee93ee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam. The document body is unreadable, but the heuristics and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sipzip.com/userfiles/file/54803847040.pdf In PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/49338718730.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/gorofofedareroline.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135acb4be626---ruperipixoromoxewe.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/lugekosajovumevonizon.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/funujabelolona.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/15875229913.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/nezemo.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/93025955995.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/totajolegaguginufosas.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/loxomewi.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/3373868958.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210928214602983.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a1a191b351fcc4a3a8454cf2c7a33e70/26709215060.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/datekapun.pdfIn PDF document text
    • https://newoptic.sas-global.mn/uploads/files/80994642747.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/nusefubojovigujanoleximek.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/fadibigolabelamekivelo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3e59235e---velawiloged.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/98373850561.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/jijepeteg.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/laluzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+set+a+voicemail+passwordPDF 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_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 10712 bytes
SHA-256: ebe23bfdb303f644137d3439efcdef1ede1d69dcbe6ccbe8ea565577dc44b11c
font_01_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 17100 bytes
SHA-256: d9f045a5e399ab586df2bbdb6e91f95024d738d7b52608c4b98f0315ef12c9ce
font_02_sfnt_off00011d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1