Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9bcac3ad275a7fe…

MALICIOUS

PDF

92.1 KB Created: 2021-06-26 04:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ae473d5cd302c6ca26767e84dd75185 SHA-1: eb6fe086aef466e9bbe257edcdf3a1c111b54505 SHA-256: e9bcac3ad275a7fe50b82399e08d3000d65666a8dde60aa0c8eec71d9017e0b5
196 Risk Score

Malware Insights

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

The sample is a malicious PDF detected by ClamAV and ML classifiers, exhibiting characteristics of a phishing and malware distribution campaign. It contains numerous links pointing to compromised WordPress sites, likely intended to host and deliver further malicious payloads. The PDF's structure and the presence of multiple external links suggest an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crewmak.ru/uplcv?utm_term=body+captions+for+instagram
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb422731b---12374707210.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/46a2e9fc6aeadd7d61c60022d61e3ace/sudazukepol.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e5a1632a0---57045024965.pdf
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/xuwunesoluxepojorem.pdf
    • http://tasteofruraleurope.eu/upload/File/27324946009.pdf
    • http://tamker.hu/userfiles/file/bezotukekadiw.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608132abe78db---baxejowefulewafapununupa.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f796b5b65f---jakike.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608187a4bacb8---99675125448.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded536737e---66842296789.pdf
    • http://sooclose.eu/upload/File/tadesox.pdf
    • https://searchlink.org/userfiles//file/dagatunubojuwonu.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a982844393e---lalesejipiwadat.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ddeee8224---81278341227.pdf
    • https://roomart.uz/ckfinder/userfiles/files/28995069367.pdf
    • http://rocb-ap.org/file_media/file_image/file/58050651805.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851dcd3d63d---90865559035.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/1067a8ad22504908304e5a16e9660e1e/64682474836.pdf
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/zerane.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/hi37oohnfqtb9l0qttdb2glnp8/87759674661.pdf
    • http://www.peretprod.ro/content-images/file/lulebubajemetutaseribiz.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5396d111fa---fivudite.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_off0000ffe7.bin
31968a6cce7f326f32b25980d5b596ec077d15eaa4a60e75d08d24f9ce36c56d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE7 19752 bytes
font_01_sfnt_off00013219.bin
4aae05fdd985a85c9265aa779e3f15d231df621c1814314043e8c1b09c3449a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13219 10952 bytes
font_02_sfnt_off00014b5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5B 16792 bytes

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