Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9225f5de7b555e…

MALICIOUS

PDF

76.6 KB Created: 2021-07-08 06:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a8fc57a9bedc9decf8e67c76004463f SHA-1: 9c8db0b5a671845226b394eb7f943dbc10deb387 SHA-256: 8c9225f5de7b555e0d3138258925ccf88ba8e465a024aca3277389b90c62ca95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. The heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. While no scripts were explicitly extracted, the nature of the PDF and its embedded links suggests an intent to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://inwebjor.ru/uplcv?utm_term=automotive+mechanics+by+crouse+and+anglin+10th+edition+pdf
    • http://gasthaus-steinkirchen.de/img/editor/file/xozejizuliwojazabe.pdf
    • http://tz5168.com/uploadfile/image/2021/05/30/file/20210530_123252_197.pdf
    • http://ankamet.com/userfiles/file/regusemoxepukamide.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/57c421db67b282a9063e0976be6784e1/85154629005.pdf
    • http://www.gesas.it/media/mailinglist/file/dufifewojudavuwovemosevu.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/82a8dc411b5207d7e08b8b7972d45784/firowuguzuzar.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607209c71e5a3---33258705724.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160902e037eef9---kinesedinivalubaromoduraw.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/95c857c67ab7097db4eac3ce880c7dde/suzidiwegesetar.pdf
    • http://bajcsidavidfoto.com/_user/file/gupoxawilitatetufubi.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e26391cbb5c---37010626479.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d15d1a34a9---85647577682.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a865c189270---84618868149.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607278b42b906---xejelatafexivog.pdf
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/nukilokew.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/74b1e3eb2c720ae4a99054ccfe8e41de/7319683312.pdf
    • http://temple.mo/userfiles/file/71610918772.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/3a7afe8e4db605dba939c99c1512af88/46095461625.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/939a379bc89bef415cff7894436312bf/vudigefi.pdf
    • http://jdhs77.com/clients/58520/File/26128095609.pdf
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/b22d0ca93bb0aad2ba0cfb985e1c7f6b/16384154431.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/4pd63huu7n55187iqk69b88sv6/zevesafexegibalanomumo.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/88ffed83e5e7be81ced7cdc3d76f3145/47024986033.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0672cbb684---gapupebirulasalapokavova.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/261uhahc1g2gd3dqoucqtgbljl/revutumubowaperopabixur.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_off0000c52f.bin
8861e4a967aaf9e512ee1dcd06ca7c5deba3279bc68548a5afd8780fe08e81a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC52F 16808 bytes
font_01_sfnt_off0000f14c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 16792 bytes
font_02_sfnt_off00010963.bin
41ce01c66c89e06c438f44367c14378d230954fb2ec7fb3dccc66246dd617675
pdf-font-stream PDF embedded font (sfnt) at offset 0x10963 11640 bytes