Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f71a8fabee0f26…

MALICIOUS

PDF

111.1 KB Created: 2021-08-11 20:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b23bd152275f4f31ecb5727c00ff71d SHA-1: 845358067666ecdd3480a66703370af8467cb534 SHA-256: b7f71a8fabee0f2632649e76c7563a0d81313903e044c0da79bbf94aa9dc2d4f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based attack vector.

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://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/6a47ad78a0a17d1b96ec0f16d7ed8c34/sovalufopivisorigif.pdf
    • http://currycornersugarland.com/admin/images/file/momof.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4dfa564ce3---goromadivugepawedimo.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f7fe14f5ab2f00ab95ecb502d55ff320/25257925448.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/8e84fabae717ea75de09d4971b3a5e4a/89880899892.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/ea8b01d0e4674009bd3ee8647e0c1829/24005786290.pdf
    • http://trimblehighalumni.com/clients/84492/File/71334354910.pdf
    • http://harasim.cz/uploaded/files/zaduditi.pdf
    • http://alnadaoil.com/userfiles/file/jumalalogolafevojokizepum.pdf
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/t0v0e81lno993438v3pb5nbbss/nifomanitopegamufelizut.pdf
    • http://laser-piskovani.cz/democms/userfiles/file/73648689943.pdf
    • http://ngocvietbungalow.com/upload/files/46964073903.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087dc702f783---figazon.pdf
    • http://pillshop.ru/uimg/files/nunidaduwurizopos.pdf
    • http://www.parinet.fi/tiedostot/files/38496962329.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609e124961da3---81665459776.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841f1fe6fa9---23384520116.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e9da9091b---zarugulejanedakukiwu.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077df45ad1c8---43423913864.pdf
    • https://majorsagilekvaros.hu/uploads/file/45364156449.pdf
    • https://isleo.com/i_photos/file/93702228983.pdf
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/51644280818.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=saque+dep+-+cod+87+o+que+%C3%A9
    • 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_off0001466e.bin
1f3a7008cf4e3c61e60a4b8115c75b1876be7d46f58ea87fd7e0d7d33d2a2547
pdf-font-stream PDF embedded font (sfnt) at offset 0x1466E 21716 bytes
font_01_sfnt_off00017c58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C58 16792 bytes
font_02_sfnt_off0001946f.bin
fec49c61f2a26ca7ee48a0c6d616693e4b19d2e39121f87c822eef30c598f553
pdf-font-stream PDF embedded font (sfnt) at offset 0x1946F 10664 bytes