Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab860ead642f81b…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 00:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 685c4399bf01f6bb0d932988427e02cf SHA-1: 0864368e415cc55e8a205c9ed6528796831dff83 SHA-256: 6ab860ead642f81b55fb3861db5a55add7c9244411ccb3c9e8288433653e0cc4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains a link farm pointing to numerous websites, some hosted on compromised CMS platforms, suggesting an attempt to distribute malware or conduct phishing. The presence of embedded URLs and the nature of the link farm heuristics strongly suggest an attack pattern focused on redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://deforma.it/userfiles/files/40272475120.pdf In PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/lebedesijopo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c61695c308431c92bb1686d3e8c9a8a/bupagekosami.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/desisurotepezalemu.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/82830744588.pdfIn PDF document text
    • https://limsurempat.com/contents/files/xizimefiwefobonekavala.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/18486284148.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/ab53fbfa3c8d9e4f64b17dc5c0624696/15703259434.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/wuginomufaketuli.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/32201900427.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/jukowajedexutadovu.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/63823d4abf0b4742911c938daee60fa1/91271180846.pdfIn PDF document text
    • http://duvarkagidierzincan.com/userfiles/file/sajanokojamerutebumamilu.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/bemexamokovomisor.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/59130230965.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bf2daa88d---55589204981.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/77257008886.pdfIn PDF document text
    • http://cartopack.com/Images/file/57876356457.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/66247340970.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137520b9be36---kolam.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/54143574677.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/subukaladukigemoxakiv.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/zukexagiwokutikozotix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=valorant+new+patch+skinsPDF 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_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 18860 bytes
SHA-256: beb8565b940a64aac81854f7e9722564e574da9cdee8f523feccb26f13918303
font_01_sfnt_off000123b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123B5 10616 bytes
SHA-256: ada105ea1c6d3b75ad9e40e7e759f4ec6ddcad130c08e6e9d1b8b73ea1454236
font_02_sfnt_off00013bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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