Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a304d79e67ba30…

MALICIOUS

PDF

85.2 KB Created: 2021-07-17 09:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d573c2f88d0b824543fa07ff2934a5b3 SHA-1: 79bfb019d07dd292282fc5eb80da8aa9dc7616c0 SHA-256: d9a304d79e67ba30cc74b7c52269acc023501502a22ee1eb0a7c8e03cf48a822
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous URLs, many of which are hosted on compromised WordPress sites. The primary goal appears to be to lure users to these external sites, potentially for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9a28be5d3---99288071502.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d8f954f191d82ea7a5e3fb63b18f339e/senagonadamobusi.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e025b903b---99646166334.pdf
    • https://coil.hk/upload/files/wiwoj.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e8cf74b6c---10446217225.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/vesubemiviteridezuwi.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f796882ee---xunekolazewegavulupilu.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160941ebb7d927---18524059592.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c360c2e4574---59708397283.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fe8cd109dpummsh4k5c72up1ns/bisulejevogigum.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a015017a20---55771669749.pdf
    • http://veitali.com/upload/files/fones.pdf
    • http://klimagra.pl/images/wysiwyg_img/file/68040687105.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d72d20fa5f---38314542591.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b137b7d73a8bf49b23ff2a3cb425b3cc/59526170247.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8742270700---zamine.pdf
    • https://10glazsikeyrosa.ru/file/nefebe.pdf
    • http://barrybusiness-crm.com/ressource/devis-photo/files/milapefavubegotinaba.pdf
    • https://digireg.se/upload/xipovupon.pdf
    • http://ip-golubev.ru/ckfinder/userfiles/files/91486413442.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db33dce9457---92269482701.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606f19b61ac19---jusiwefaraboxefora.pdf
    • http://x04ydivan.ru/userfiles/file/vegin.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=somebody+once+told+me+the+world+was+macaroni
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e816.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE816 16792 bytes
font_01_sfnt_off0001002d.bin
2a3ea7df01622e813313be83e7207abdc39f93bf2a5a1ee1b91857b579aa37c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 11048 bytes
font_02_sfnt_off000119c0.bin
28d4879cb49d4593ddbf6fc38943f9cdc4c28db9cea8b7f2cc3809c8ae268cc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x119C0 17468 bytes