Malicious PDF — malware analysis report

Static analysis result for SHA-256 1762781e9774e29f…

MALICIOUS

PDF

88.0 KB Created: 2021-07-01 21:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0f444f2fb08d611586c39fa0d04b712f SHA-1: 5a5b2f55f092c9f6c1952e72e643fd6019bae1f5 SHA-256: 1762781e9774e29f07d2dc559b334022076f442e577fa67f0d368f19887ee024
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=glory+and+praise+to+our+god+lyrics+and+chords
    • http://smartwealthhk.com/userfiles/21317148802.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609c55a24c3ca---15908591862.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4da16a3fe---45202439110.pdf
    • http://olddieselparts.com/ckfinder/userfiles/files/mokebutig.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d11dc9b5a---jadizuxozodesuxiligom.pdf
    • http://studiocalcinoni.com/userfiles/files/mulog.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/171ac2ddef34583e9c40f5018c68c154/16039153805.pdf
    • https://uleshuzatabc.hu/files/file/65913546961.pdf
    • http://allycatering.com/userfiles/2136376841.pdf
    • http://auburn-properties.com/userfiles/files/sowoje.pdf
    • http://aquatherm-graz.at/files/44232582938.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754464e7501---6018397608.pdf
    • http://qtjdb.com/UploadFile/2021/06/12/file/20210612_165436_137.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1d590f65d74f03a03536c57bd78fab96/bubodonekesuvuzidavit.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17e0b1e98---kalexevebanowoxabumanari.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24496889396.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ddf545d0341---nimiraxuradefovora.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd89116df45---72126161097.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/071827a27c50555d3d21c963b7c676d0/rabesifofukatijoluruvi.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160720fc15543c---36129407548.pdf
    • https://divinenine.net/userfiles/file/73630268474.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf78a3ac4d---72010387447.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c83cca450---60638065455.pdf
    • https://bisnismedsos.com/userfiles/file/59823718329.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16093b3e3ab7e5---55991709517.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/texarubone.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_off0000f196.bin
b3db974f52529a27eacc72abe2c15551ba938d86ddb021b024787eb144a0e607
pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 17944 bytes
font_01_sfnt_off000120a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A4 16792 bytes
font_02_sfnt_off000138bb.bin
72b1d01c695d4e55ad41bb4b896d06786d08db0e4e74dae6c56f376bf95470e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x138BB 11044 bytes