Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46c4d3f6aaa49c7…

MALICIOUS

PDF

121.6 KB Created: 2021-07-24 16:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f16d94d44b0e0e967c6267acf71dbd6 SHA-1: 8f710278dde6bde3f9dbc59f981a129992c93914 SHA-256: a46c4d3f6aaa49c712c73d551d3248b94cde3a4c96c01ce87d425c932f84b090
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. These links likely serve as lures for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 https://topinsolventa.ro/userfiles/file/86726084559.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/6i6fp3ihmclbumfqefpobrsu0i/sipibagudenid.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f92d9e484d3b72cf671dd4aca7d70182/tukabide.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/8198bb15c49811e87c136a11f2e9a4af/kuleredimegilidirunibug.pdf
    • https://www.tristar-technology.com/ckfinder/userfiles/files/wevesufupededit.pdf
    • http://hamyarsanatco.com/ckfinder/userfiles/files/4069020366.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f496ecf5---57442499277.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a154ec63457---gamokif.pdf
    • http://tpdw.pl/userfiles/file/tafasosapigel.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/xakozoxufuvajefikudabu.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607a37800ff8b---vasibalofu.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071da0f9d6f4---mubatibanobupek.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609a37213d2e8---luxasudenuk.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b09f0613555---nerigi.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a752cdd55---8481960079.pdf
    • https://aslimitada.com/userfiles/file/16623234331.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/df8ieju2dkghdlqvo9in8gebt7/kuwanipokajusubila.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd480a571d2---disex.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3hgo2jqgkohrfevppo7ooi1953/76959474758.pdf
    • http://nwatchonline.net/userfiles/file/28083881054.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef2b32b6d---45628862258.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/vktoi0fkgo39r6bfndt5lcv2b8/robofe.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/lobedovamuru.pdf
    • http://marketypik.pl/zdjecia/fck/file/bugurep.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/34d12f069d6d182816bc6e293db022ea/koxulopinudumuxufiguwiv.pdf
    • http://bigsvatcharasith.com/userfiles/file/7245723703.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mercruiser+454+service+manual+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_off00016f8e.bin
08391de61a49ede31c3d85ab37fa13b80e43c50a44207aeff0b026d08a8de64f
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F8E 10932 bytes
font_01_sfnt_off000188fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x188FA 16792 bytes
font_02_sfnt_off0001a10c.bin
5d86285e4d6503f3bbc6cecc98f7e675bc82b0da86a30cfd7409703a11fa0e7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A10C 20808 bytes