Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c3b17afd2e4a08…

MALICIOUS

PDF

88.8 KB Created: 2021-08-14 04:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11ce6a968f8827770f493363f5289813 SHA-1: 4824b3e4524c8360fadc8adfb000781a6018120d SHA-256: 07c3b17afd2e4a086c6c154db37103e292a24997c62f2fe057497f18e532dfc6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised websites and disposable hosting. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the intent is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://crysiq.ru/uplcv?utm_term=how+to+bypass+the+parking+brake+for+dual+dvd+player PDF link annotation
    • https://agrimal.pl/userfiles/file/dajirajumududi.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/43580601710.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c1eb3d4319c---redaka.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764f6387fc6---6782518187.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abaafd851d7---79457196172.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/2mmqqeseqmj5dqfiboaau9msj6/49392763811.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b78b6675196---kitivax.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f9b0393f48ce58b28eae40b7eb6f5e18/57913008497.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/594a06cd729bf3c20fff8fe839db9e46/36931183280.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/eb156f49ff81cdb957516c9fac82747b/pikodonalawikez.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/gusexeritujedabitat.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/munariwisegofakosikibofej.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/liwoxedaxonefegarusego.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/ast4ncrb5l97d4lhihlsi1j4l6/76380312996.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/wijilojagelidefiwe.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160963da3527c3---78974827106.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607254c26c0ad---61133972138.pdfIn PDF document text
    • http://rafaelokazakov.com/file/wamovukikidixexizukiwu.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/wazovobofizulabevoxulu.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/47044572727.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca981ee223---refufobenisen.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/svsfkh4evi552m0poeb62gn65f/912893513.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/50393672817.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/gunemixidanozuvominar.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_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 17756 bytes
SHA-256: 74e7d2687444d1123d8bafa83057e77a5c50fe5ad08dabf8eb4ef96e45f874e3
font_01_sfnt_off0001219c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219C 11364 bytes
SHA-256: 0fb2bd77aa30e9a0fc852344760ce268b7bfda57ef2452b884f8c37e30da848e
font_02_sfnt_off00013bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1