Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d98a63ed5e6732…

MALICIOUS

PDF

84.0 KB Created: 2021-07-05 10:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91dadcaaa29e4fabf61767720e160c27 SHA-1: 336858f8552929f7e509554a453f7ddd0033b51f SHA-256: 28d98a63ed5e673270fbf25f1471a1bc321e46f88a8dff472cfed88ff66cb623
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The embedded URLs and the nature of the heuristics suggest an attempt to exploit user trust by presenting a seemingly legitimate document that redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/39c5154377e46c6a9341686c2347c7ea/zibivivojug.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/6qrd8cfc2kou7flsha0q4jt323/kifefatoravuwaletaw.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/m4fo0hmbce8n1f44a9bb07a571/98422164361.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e08e39298c---bipadabeta.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8297ac434---36883208912.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c218aa0b696---30935429662.pdf
    • http://zwickerfoto.hu/_user/file/sizeginurizomefumuda.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/18b40e21cb879355329a34ca46a7a6b5/85695883855.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8e460371c4dc84663d6864bd30844ecb/bafivonelizaz.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607045a9cf5c4---78632497913.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dec4626a82---23482724078.pdf
    • https://aedwea.com/upload/foto/54251269704.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a8f6f12bc6d7317b9e3b2a1a0bfbfc3d/nigodujawero.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf715dc34---kuvadinososuxesowiboser.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160de08a49812b---pusozukom.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/igsca7ihj1t66a3b4hehks7v4e/25429564336.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d8bc12e5cb6d1eb48694cc1fc6d9aa29/32281319830.pdf
    • https://penzionradvanice.cz/res/file/pubebekidilo.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160762e37aa82b---48326373091.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/0c2a2c9da46260c8bc7efee08ce9355c/14534587002.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/14a6cf54b70fa6145506a4a027b6bd88/59552750181.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078fe7d71161---zexulebokevuniwog.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=update+avast+manually
    • 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_off0000e4d8.bin
cca297cc41dda46b0add68dce30ea56e6b3b5ecde40fdda1ede0dea9d330f040		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D8 10528 bytes
font_01_sfnt_off0000fce3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 16792 bytes
font_02_sfnt_off000114f5.bin
50d008671c8fb6a973d268405c980adb41841ce2d892cf491891252e31c9cafc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 17140 bytes

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