Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e9967038452a00…

MALICIOUS

PDF

90.0 KB Created: 2021-07-03 17:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a354aa2a4c616a53371ebe7a69e3fb3 SHA-1: a148798a066a1b72b0324d117dcf4e4f8a22006b SHA-256: 39e9967038452a0029e75889cdfbfea54c5acf4b726045f36847844562b7f476
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8eb5d1db9---67242086013.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab5968a2fc---53721978660.pdf
    • http://szao-spb.ru/images/news/file/32453343078.pdf
    • http://vogiantinhmach.com/media/ftp/file/dotogenifapozojamawu.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/d6qfhjthe7pn2uq0fhff482r27/5407762346.pdf
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/mev5261ii0fj2vrim5vakqcm58/tinodavumo.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/aciqm5bc402sd2151fpqcqk8bp/45219071050.pdf
    • https://alice-immo.com/userfiles/file/19719363673.pdf
    • http://atthaya.com/file_media/file_image/file/zimugakowo.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/4b0072617b54ba7a1897eb9ebd90cb1c/sinugarigemesigomitari.pdf
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/36652191806.pdf
    • https://midasspa.com/ckfinder/userfiles/files/90855109293.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67fcj65lbjtcau8v77an4vk1d2/nugafuwagenozumipimebupov.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/fofajarufaseba.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160840fe12184d---numuga.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b687c8b4da---28909227151.pdf
    • http://nage-z.com/ckfinder/userfiles/files/dejutawolokotazafew.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/07bead2325ad7f0af20c3d3a8f5fb712/73441035014.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5b6714eff---rekixivategibidon.pdf
    • http://adaviestransportltd.com/userfiles/file/naset.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8e1cc0f558d864e5ec9051801e727f6a/sadofipuminimufer.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0cd85b74b8994f4dfce7c6e8a6bb4f23/jovutarevalumidejuj.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/2b4h774ieeda4lfnm7g1052sr7/lovufiwofesiko.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/dtsuqc65d5g386ga56j524u7rk/78210609445.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=marketing+demographics+and+psychographics
    • 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_off0000fb7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 16792 bytes
font_01_sfnt_off00011390.bin
852da31db12f2b1bb3a88f8e87112ccd422308cba17e3da9db832095e0c49e06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11390 17392 bytes
font_02_sfnt_off0001411e.bin
c2997d3526c585bd86673ab5f44876bb46f29b208981275b7082e3d0069e2dcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1411E 11112 bytes

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