Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a54e6b76482ec2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 02:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf79613b375afb5bec2816f398fb648e SHA-1: 39bb7cdc28c9a5a0ce452a14a1cf67e0ecb57fa8 SHA-256: 18a54e6b76482ec2db1631ecb1a283372097f4e2eabfa19b1bc1e52419b9fa82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The primary attack pattern involves luring users to these external sites, likely for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=ocultar+album+galeria+android
    • http://ig-einheitsloks.de/medien/file/60491819568.pdf
    • http://progfin.pl/userfiles/file/namomomoloxanezolo.pdf
    • http://lovesenergy.com/file/28817842477.pdf
    • https://congnghiepxd204.vn/upload/files/sonineba.pdf
    • https://rimi.sk/userfiles/file/31798542401.pdf
    • http://sage-chem.com/image/files/20210919_222637.pdf
    • http://xageunion.com/userfiles/file/37490908364.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/patufodemolixijoxunat.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613c99549144a---niluxakiveminomoran.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9ed8a45b9617a1c95602a3beb40bd9ab/puwuvejukifurinalapam.pdf
    • http://bloodfaces.de/attachment/file/43880358174.pdf
    • https://mytshirtcreator.com/app/webroot/files/file/29370649741.pdf
    • http://gokea.org/upload/editor/files/93338313113.pdf
    • http://vasekurzy.cz/userfiles/file/xefupuwexafekomojubapu.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161300c5348924---vifepazopuxijariz.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/5258316795c07fb8c96dd376a3402564/9510438220.pdf
    • http://becucci.it/userfiles/files/96998331645.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/tajorov.pdf
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/80279795082.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/vibarupudokikawugajip.pdf
    • http://turhantur.com/turhantur/files/52321596864.pdf
    • http://woodlandhills.ilovepokebar.com/uploads/files/pojesonat.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/jmv4ae5n1kiqi81iuh9nv5i651/megefuw.pdf
    • https://kurishupally.org/userfiles/file/44147125334.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_off0000d2ac.bin
d64b0947e851ce7d0050bc2f3887ab82c5c88a988f6192f10ba511cd8803e88f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AC 10808 bytes
font_01_sfnt_off0000eb5c.bin
42aa97f0f2ff514a8ab977e45742ee410803a607ed4054b21da4eaaa5b078d18
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 18496 bytes
font_02_sfnt_off00011ba9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA9 16792 bytes