Malicious PDF — malware analysis report

Static analysis result for SHA-256 2189386ba414cd1a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-03 11:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f31b79364afdebbf87774267c20477cc SHA-1: 98bdfc3fdf01aba967ecf58f03a1a01624b8e058 SHA-256: 2189386ba414cd1a3843662cac0ca2945063946be65e96cd98d65b847999cb39
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://onsijsselstein.nl/userfiles/files/16348830079.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee92521f61c---nusodobokuvudexegatumegi.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/t236lllh6fknnfebh434lekik0/92951162072.pdf
    • http://ihdbd.org/upload/files/xojibiwevapazutexajivito.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be9e3cdde1f---kokumojavefujewuretujeve.pdf
    • http://qca.ch/userfiles/file/siwumasug.pdf
    • http://halaljones.com/uploads/files/9968305456.pdf
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/57715909455.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608271ac9866f---wowekuni.pdf
    • https://vivaldiroberto.com/img/files/mediafiles/file/50585974764.pdf
    • http://blossomtour.net/FileData/ckfinder/files/20210723_AAA251FB66AC5A76.pdf
    • https://andrejc.si/files/file/70266715982.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df0c6fd7394---nulujavagufobarin.pdf
    • http://hrjok.com/uploadfile/file/bafibiwetenagavuvoxu.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6b4d23aa4371c5aaaeab95bcd0ffc8c2/8065705315.pdf
    • http://beta-rc.com/upload/files/kekoseledijapawew.pdf
    • http://www.vegagastro.pl/upload/file/95165565372.pdf
    • https://indianpowerliftingfederation.com/userfiles/file/82635122225.pdf
    • http://mgtofubbq.com/uploads/files/belupoxarulolik.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/n2qg16364ihqq9nlg2b919tkf1/lufoxivusedumas.pdf
    • https://fnb-concepts.com/images/uploads/files/depinimowexozivasago.pdf
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/83860987201.pdf
    • http://polskienarty.pl/data/aktualnosci_imgs/file/92105195745.pdf
    • https://sssmri.com/ckfinder/userfiles/files/raraziwabek.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=niobe+pathfinder+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_off0000e65d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 16792 bytes
font_01_sfnt_off0000fe6f.bin
38fe595e3d5dd9d7d86f4d6e6e61301fd0656fbddd7a4df3e096c943a13144f2
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6F 19140 bytes
font_02_sfnt_off00013057.bin
0c93e5c22c60c37b52ff726d85bf9673ab9b96c0f85fd6ee69eaa0ef495bf212
pdf-font-stream PDF embedded font (sfnt) at offset 0x13057 10496 bytes