Malicious PDF — malware analysis report

Static analysis result for SHA-256 664f0b7554ed60a5…

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 09:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 535e50a9142ff4595a3fe129329dae4d SHA-1: f6486053121cba53c1591de0c2b7297d63e94748 SHA-256: 664f0b7554ed60a5d128e2e7e5460e85c0b5fe4c41f7c3e8a9fd34e1e21373fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially harmful websites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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=possessive+worksheets+third+grade PDF link annotation
    • http://mariamozharova.ru/uploads/files/zozimegaxexerarujojog.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/c2qkiiu9fjq8t49tbkg6v2e6jn/94825638250.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/76390935314.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/3a17558b9359e9e6a77834283024ca87/divarejisosagutajoti.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b04ac1d88d2---fubamakemozilejujalepozum.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/wugusufisenaz.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/78570821562.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/pebadubabelagofojur.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/37474440662.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/sugurawemi.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/68148168502.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/nelaz.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/t7am90nsn6u1fu5jiiq08ijptt/gujejotatawadikivog.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/e17e399aca05100081bc6e5a69dba918/9647935354.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/16229b57fbb638104cf8747fcc4da6b0/mesomur.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202182857368838.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160738c35da34f---mubejutinanabezakebo.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/uul51n1fppmhtdemb683dfq5u2/61090398641.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/25d8d6d4e6909a2f39ff9499f58cf5e9/8435420953.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/lifapikepuvupugejo.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/vexuvogewarerogetinufekaz.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/c8aebdf24412d8beec69f581d7c45b01/pujazivor.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/78893148318.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/415705a8c4a51e64a95c61b5ceae28ee/46788853023.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/dexegosizewuvan.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/lekuduzowuzanuxosanux.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0C 17804 bytes
SHA-256: 5cb59c89a779ab0e12487b5c7d185eeabca05a9281d5c80d23c0598c6c12eb97
font_02_sfnt_off00010c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 10624 bytes
SHA-256: 319c0ff0e63e870bcda8ee3a3bb31b861048d2d7d2b2b095bdae207cb5abaac8

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