Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66f636e7e11c8f6…

MALICIOUS

PDF

98.1 KB Created: 2021-08-14 13:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ee052d32e7b974967f96a0bc694334f SHA-1: 37d8c9c4bf85fcc2ba61193ac3d234208ff85ae3 SHA-256: f66f636e7e11c8f64390fbb9de3981b6e8b8f541fa8ae25da7601a63fa2a5d96
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/626e92cd53598fc2c97ef14d146f82f1/nenejawuxawa.pdf
    • http://magiepourenfants.com/images/mediamanager/file/zodemiborotomaxa.pdf
    • http://fotossc.pl/_files/file/gokelajowamovev.pdf
    • http://alconburyreunion.com/clients/36523/File/95154569410.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097e8c56d9d8---gituvara.pdf
    • https://www.eos.org.eg/ckfinder/userfiles/files/69375186454.pdf
    • http://artpolinakuzina.ru/pict/file/tomiresosovakag.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/53982213218.pdf
    • http://privateeducation.sg/verzsape/demo/upload/admin/files/11000386703.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/bac97ef8e5d8a516a2d2ab16fd42643b/soxiwat.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ld71amcmb7ubt0e768cub3vauf/tulojexezawisejapegasid.pdf
    • https://polandpools.com/contents//files/balijijajakekegij.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/eaec754dc63291f37023491e824037ec/kajitex.pdf
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/62000273395.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ededd98c903---74267486060.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f2f38bb39---82230468896.pdf
    • http://www.patriarca-batiment.com/ressource/site-image/files/61365695719.pdf
    • https://parc-hotel.info/file/84447002258.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47e4d21901---49954133000.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/25adc6e2cb6f4b99d6ed97760cf96c20/gejabozerilumexikotozapa.pdf
    • http://accessiblevehicleservices.com/userfiles/file/55239229772.pdf
    • http://nhs1968.com/clients/65482/File/keteza.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bose+soundlink+mini+2+firmware+update+mac
    • 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_off00011688.bin
c61c3fdb05d57211b5b1694fa41d72e46bac2c78abe48a43e9482ccd42942a5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 11232 bytes
font_01_sfnt_off00013105.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13105 16792 bytes
font_02_sfnt_off00014917.bin
96047a13c872208fa37feb46a875181ba77d4277cd4e20715e08b4bab4b4af72
pdf-font-stream PDF embedded font (sfnt) at offset 0x14917 18752 bytes