Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9fac3d43ed596f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-01 12:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 87193c5dc30a8025a8b324ea6e4cb1c5 SHA-1: 11f6afc60ead4b11594564d31b8be54530124b0c SHA-256: 0f9fac3d43ed596f4bea665c31451855fa635476fcb60a5a66dd7308c1e6732e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of these links suggests an attempt to lure users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://krisoc.ru/uplcv?utm_term=5+minute+countdown PDF link annotation
    • http://thaisomboonautopart.com/userfiles/files/jetavabowurozazexemu.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/berunopuwotaba.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609f75c8863bb---83568983102.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/e41isqsgk194emp767406d09sm/lolumuxolo.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/68bd7a0bc231cd281f23ab6819d1f689/48170028947.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/b2a79d9e73dadfbba46a9f3977ed9673/89419144644.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/olph543i19betbuaii2oi1u0hs/6327364465.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/88ee0bfe5e797c541a851f7130f0b672/25135330710.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce85f27ab---vibovarilajozedanonulubuk.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/penutisefetezenor.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/rifev.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/modabukotisilebasiva.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/7445266130.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/qmmiei7g26ru14n55s3cnsdv5n/48249357620.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160772d2fc0554---21409541776.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/iaqrgv952ol5ss4p2lqpdsb0h2/wefosuvasasew.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/kofezu.pdfIn PDF document text
    • https://music-group-store.com/upload/files/jurejenofibupanipu.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/vagekogul.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/peretajitomo.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/wixadilixobugewi.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160876d3d81862---10535999020.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/93295034121.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/83074611439.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84F 17136 bytes
SHA-256: 1a4ea8fdc2567cacd30f79865e060d37e361088ce496f0d7d4cd0640f6cb67b3
font_02_sfnt_off000114c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C2 10276 bytes
SHA-256: df52973b64c7b2825823d857ba9beb3ea65c00663e6b6e09a514f31005d28b3a

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