Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc25851849eec4dc…

MALICIOUS

PDF

87.4 KB Created: 2021-08-26 14:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e90ea05233d4cf54ff2c38ddfe7e3ae SHA-1: 204208b853b73c6940327553d160ca718fdb680c SHA-256: cc25851849eec4dc33caf72ae9f3b100c7743cc168316c000db2f19e96e352a3
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://drafthe.ru/uplcv?utm_term=tv+guide+magazine+crossword+puzzle+answers PDF link annotation
    • http://bakineshr.az/ckfinder/userfiles/files/joguwosodagorajigex.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/widezaxefuxifejovuzomis.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9e6c97be1de024f38cde035008e98a2d/ramikidobomevasoduse.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/38cqleu4g4vj22ac58u0qmrf90/93316179823.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/nawejuxu.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/55105761360.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/69703340512c78c7381fcb6f515d9e8c/76532743450.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/bapelelidefafan.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d71103037---86558768444.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/wikudijugadiwenemodubogow.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/rapadokimowasaf.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/92035536527.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e2cf4d49f73b27b29bf83bc894e521e5/bumarezotuvumojip.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ddf65f8ba5bbee38f58a6ea8b0ea8edf/soperibulerefi.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/93291944021.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/4d47ea90018011cbe384487d793685c5/53753346425.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f34a80b5901---94770341581.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/lqtvlbrj327hiag1rgofmi2c0i/feregaf.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161057058bc099---rubanomovupo.pdfIn PDF document text
    • http://momsystem.ru/public/file/41024336949.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/1639447661.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/sedebobixume.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_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 17472 bytes
SHA-256: c33d7ff3162e75782332b541ed0807bdfeea2802c0b3c61525dbf3cced61c5b1
font_02_sfnt_off000135b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B7 11036 bytes
SHA-256: b51ba96e482ca5fedbb329b9f2285c963e66c1ac9a1b34468e96e20a155d2766

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