Malicious PDF — malware analysis report

Static analysis result for SHA-256 355d6f2748812347…

MALICIOUS

PDF

86.9 KB Created: 2021-07-13 19:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 942dafed26e5d5d0c59602ab7c1ae9b2 SHA-1: 443bd9be514bdc08347522ec15e751d7b1d08f58 SHA-256: 355d6f27488123471e468fa00b4ef827ba168c7a17fe2ff417ad9d59bfe7fb1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to phishing pages or download further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the final destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://gemculture.com/userfiles/file/69028968595.pdf
    • http://lapenya.cat/imgjovesnaves/file/16737215821.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/96ce673f83cf92a0bf12313c039de124/xodewotapuvopizo.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6195d1614---72701289338.pdf
    • http://cdwy028.com/uploadfile/file/20210525051513.pdf
    • http://curry-box-deluxe.de/userfiles/file/77953263016.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160928ca6a1856---kumosaxevuw.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/bgls5jasb4iurcqqn0gl4cj02m/59170352736.pdf
    • https://happycolaborativo.com/uploads/files/dovipogexijexurodu.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160942d6e853f7---wopulezazo.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b29d99a5e3---demoronofogudumarawuzon.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e1fe1071ed6---dutazekukijamosojukexe.pdf
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/dowopuxenitememilujalefem.pdf
    • https://tycoonmarine.com/userfiles/files/21355230979.pdf
    • https://asiastudy.in/ckfinder/userfiles/files/jixopiduzasisinenorusoza.pdf
    • http://bidmitt.com/img/files/file/78388274323.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160af886946c52---pifumovaba.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/28f97d3b5269cae83cdca7b321c16a47/gulovapotodefebal.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/ah7r3v1u4l4e4qd8mia74otueb/mixekupimetajavap.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087d28d896e8---38074218079.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757a17f3ae4---7251226103.pdf
    • https://baxsporthorses.com/userfiles/file/20422140700.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3a3815c6870786d866665b2194c45139/89124024161.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/afcac379b81e2c5f78174ec435b7a0c5/nimudorejedo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+should+i+put+on+a+job+application+for+salary+desired
    • 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_off0000f0e1.bin
c3e6c3ce305bce3e7615ec01b67fc21694938bd3be196179f6771c42f0a42c7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 11192 bytes
font_01_sfnt_off00010acf.bin
2c7d057874edd37cad09cc8cc3447b0c6f1ff0223877da00b0d4a537f828285f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACF 16808 bytes
font_02_sfnt_off000135c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135C7 16792 bytes