Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0acd8bd4556dc3e…

MALICIOUS

PDF

86.0 KB Created: 2021-06-26 15:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92eb94ce0366782655283d9656c62f0f SHA-1: 8e68092e6b7ed52d2825744388a80f35a99d6993 SHA-256: f0acd8bd4556dc3e0473523112270dcea4ec1ff6c82c8682ffc39d53ca650741
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aire-limpio.com/img/editor/file/47924496828.pdf
    • http://sarlampa.ru/upload_picture/84383658370.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731583bcec3---zadujip.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/32b2774ee22b31a805f2ca6508ceb32f/61401529679.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f07e8a0461982d0f6326ed070daf26e7/fofidosuvutizitebiwubusev.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863fd98de19---45048899425.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/21352462482.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1deb45d4b---dejutivubokevarivuraw.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/3fe043ce6a0d9e7cf61e4eb033811aa9/65725094986.pdf
    • http://cafemsoffice.com/userfiles/files/wemokafubigogodojo.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e88cdaf885---memujolapi.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/5c2173caafc8069cbd825ced5954f832/93424522050.pdf
    • http://aldara-latinoamerica.com/userfiles/file/39080151406.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ea9c42a5b---32221332256.pdf
    • https://people11people.gr/uploads/File/direpijulixubadikil.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/uvpjahpebm3rd9bl0iuhdgkkb5/pedufitaji.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160921550a774c---85548418763.pdf
    • http://savvyais.com/userfiles/file/83064850926.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eec5ce9e10---dujaxeru.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/52732e17a8c63db2f4a00bd766a73c72/sunusataxasebeguvurujojuw.pdf
    • http://progfin.pl/userfiles/file/nezavegewaniwujafopef.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071a00877f9e---26714545230.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/92mrunm3uu2g8slca5qt6ffqg4/minonezirosuveg.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/eb815c5882506cf0549475896c517182/xinuzegiwisomegedumonuje.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=does+purified+water+go+bad
    • 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_off0000eca8.bin
77fe0cac838d6658389918abe0d4fff79ad2c0264c449c96fd432b1e73d99c1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA8 17292 bytes
font_01_sfnt_off000119d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119D5 16792 bytes
font_02_sfnt_off000131ec.bin
3f6f74eb3df1691a2e1cd87155423c6454a78684fe3192a231edb37ec0bf94fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x131EC 10848 bytes