Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f36115cbc99c090…

MALICIOUS

PDF

86.1 KB Created: 2021-07-07 06:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d02de39624071d62cd45789d8bb81b7 SHA-1: 5075d47adf4a8c84303bde7f962b718e6fdc048f SHA-256: 2f36115cbc99c0909a195b70a96c2bd09a476773e552d3e6ad1b0a57d39f648e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing lure or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b775d921394---wipojanaxoxizijugixamaga.pdf
    • http://susutour.com/userfile/file/samojoxodigijag.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e248c741e0---danijakewoligojisotigapa.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/u1ap8eju1novpn9fk1ghn9anb2/44302379408.pdf
    • http://sunarfactory.com/userfiles/files/65540852784.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8a9ed0c14---vatajizurafonimorasikoga.pdf
    • http://qytbearing.com/upfile/file/lavefajizexoxuwekawafumux.pdf
    • https://ive-cal.it/file/zopeduwirudojem.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/684j28i2jbknt1hbt47gv7ldn5/terapuvadoxof.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607472ea8ef57---sitomudam.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dae986ad452---lotajirawodipinati.pdf
    • http://dichvutheapec.com/upload/FCK/file/65193458481.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f603986d49---purazobizeropako.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ac5d892381524618976566aced0317c5/17381775962.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815c141be3c---fexir.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mboefoi5r5r9ten0dluusuecj4/vesidolabozabetale.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/3ac5ae0f435623000380339858ee028b/deromidowenenedulote.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bafed693178---76534745132.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607092dcd3ffd---50822106174.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160db1023b05c9---ninazoketovudarib.pdf
    • http://lookkorea.net/userfiles/file/37260739078.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/aede38ce40464928d218e811d7b0e29b/47762486949.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160888b1c01a67---katisodemever.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f8101c7db---77502731729.pdf
    • http://shuswapladystriders.ca/userfiles/file/pijevin.pdf
    • https://evergreencans.com/userfiles/file/49182152192.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+connect+your+switch+to+your+pc
    • 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_off0000ec68.bin
0b5e2bbfede9ad453ad597e425126456d110ac0b1c7e0e68e37661a593b3a25d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 17584 bytes
font_01_sfnt_off00011a85.bin
2430ed9608211c350de1c010798bd237da51284e1d82e287c3f31f517ea833d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 10556 bytes
font_02_sfnt_off0001329b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1329B 16792 bytes

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