Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36ad35171881e58…

MALICIOUS

PDF

76.0 KB Created: 2021-09-19 13:07:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e3887ef4b8c17c9c33c4469abb6d1c8 SHA-1: 9c1510eb440316b57db69283b191a767cc54e4ab SHA-256: d36ad35171881e582c760e3b8394471ae04e3fcb37f92c496aec54e394a3d31e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many hosted on potentially compromised or disposable domains, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://etravelbox.com/scgtest/team-explore/uploads/files/64221250219.pdf In PDF document text
    • http://www.juthamasclinic.com/upload/finder/files/28516049559.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/zamefikan.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613711318b617---jodoxilara.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/81099180215.pdfIn PDF document text
    • http://freestyler.cz/img/file/lodewawe.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d15564674---43322450664.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/1098233584.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/39620194212.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/sufunade.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304903e45f3---55652112484.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/52008423723.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/4892986978.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/77868204061.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/kotawikupimavekimojujip.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/44209513122.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/jimoxevotomu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/vifawu.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/84071899477.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/senix.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161335ab280a8d---daberesilodalibegoraret.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/16338433130.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/kevej.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/wometanamewezonidis.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/bf251f53b2dae790a17072418fc45068/49479656191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=microbiology+demystified+pdfPDF 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_off0000c4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A7 17008 bytes
SHA-256: 8840227b462ea1e1865ca2147eb737d8ee3f53690a1536299b4577307371a811
font_01_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 10944 bytes
SHA-256: 0074eaf651ba1922eeea63e0fab37a2298c41484256f60dbb45a3c8da240ad6d
font_02_sfnt_off000109f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1