Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8264e1c83eb3565…

MALICIOUS

PDF

84.4 KB Created: 2021-07-09 22:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9cd2e7a7e58651ed665de0d337e179f7 SHA-1: 41e593c3011f693816f08296efe72776e055ae3b SHA-256: b8264e1c83eb3565704d56237b9aba2a7607ab41f5e59e8f4df159f6d55f2841
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious or compromised content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm heuristic and external URL analysis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://teraval.cz/res/file/zoxupaguziximawa.pdf
    • http://ajarnveerapong.com/UserFiles/file/30045887714.pdf
    • http://bvsaigonbinhduong.vn/uploads/files/sezoweraf.pdf
    • http://abaj.cz/UserFiles/File/96616297817.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/bguhrmji865n67q68mm8srgaee/90982086953.pdf
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/8ab9ecff26e72a99d9bcf9e843da00b5/jerunimixevudulomop.pdf
    • http://anysoldierfundraiser.com/clients/a/af/af293656121fcb8b60a8c910089dd81c/File/tafimeva.pdf
    • http://tuzvedo.hu/elemek/file/53681067800.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075c7f7530cb---sivimodirefu.pdf
    • http://resetimpianti.it/reset/public/file/69384591507.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/41227509713.pdf
    • http://cortabellanews.com/userimages/dupitof.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/778962a9661509acf50a14c836978568/joromaguxoraxefezewud.pdf
    • http://broorybulldogs.com/clients/33993/File/49718167530.pdf
    • http://computergramm.com/userfiles/file/1653398312.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a87392492f1539c93f314e5f571fa84b/39513919645.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608025f008799---32409427684.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1090d8625---viwavaxovavesadozi.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/72ca94d3d7689abf5079a35e6e85165f/jigebobabiri.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/11198186389.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072577881cfa---16090255986.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=text+to+text+text+to+self+text+to+world+examples
    • http://e1pl2.nazwa.pl/busy/fotki/file/24751524504.pdf
    • 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_off0000e7ba.bin
9f098d82e2fe17305829019763674f3f6bb930e149b71dd763d5a8d43c131ecd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BA 10616 bytes
font_01_sfnt_off00010027.bin
666732de655a17ffa32f48f55dfc312e81af1c44eecbe91ad903f12f0c24aad6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 16948 bytes
font_02_sfnt_off00012c6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6A 16792 bytes