Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5be27ef988a6dce…

MALICIOUS

PDF

86.4 KB Created: 2021-07-31 17:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5cfe6775f8c2352cc551ecb44a184da SHA-1: 74dee07657d327ea1727f2f716d73a8617054a72 SHA-256: f5be27ef988a6dcec8bb1f9305e3d4e29d2c35168ddeddd98790291306503078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URI heuristics and the PDF_SEO_DISPOSABLE_LINK_FARM rule indicate a deliberate attempt to create a deceptive web presence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/uplcv?utm_term=blockman+go+mod+apk+2020+unlimited+money
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/vsboacermaig5ceci0kqifg68e/todabonifenobodavotolot.pdf
    • http://lacasedescaraibes.fr/file/64968976404.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087259868861---28838426305.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1df86f2d7---punerisazu.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/ea5218ce6089f88147fc3f504c7f4e5e/vivibazowusedo.pdf
    • http://fujavietnam.com/images/Download/49928734731.pdf
    • https://betenenergy.com/sites/default/files/file/kuxarifapo.pdf
    • http://laarakkers.com/ckfinder/userfiles/files/46860550065.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/45428514f7207198001c26c8efd6206c/20692640523.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/fb1961ba2158d813aaffdec2bde6ee83/52503639870.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609495cf0f0a6---89009076206.pdf
    • http://shqinze.net/admin/upimg/file///54844587792.pdf
    • http://phpirateboosters.com/clients/867602/File/jifawesuvameludoze.pdf
    • http://pincailight.com/zk/UploadFile/file/2021061805121773499.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acaa824dd7c---14606101834.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/47504307284.pdf
    • http://alemotta.com/resources/original/file/99865349935.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/e40f5337fd34a439f5ce3ace00b29214/vefijisuxo.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/f8432d73922ad513f4dd7e2d2fe0a106/58398027252.pdf
    • https://network-italia.com/file/nubaxufamedi.pdf
    • https://akproauto.com/nbloom/fckuploads/file/sizub.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba76a32ebe---wowipadu.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/3qime45dd8bv357soqr721um31/vozekitidudufopit.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_off0000ecc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 16792 bytes
font_01_sfnt_off000104d5.bin
d6dcc1583c770d6237858142300292feb31d3d4be974a6d647e9aa09334e5c45
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D5 17168 bytes
font_02_sfnt_off00013185.bin
1343def2b5801c6a35663e4e69b8f5e454ef17cb66c35596e5efcdcda3c33aa0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13185 11192 bytes