Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88ac10bab8a333b…

MALICIOUS

PDF

96.5 KB Created: 2021-07-24 00:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: ccbef3d7ac1dff03692173c61a8fa61b SHA-1: ab59a5324405ab3045a837a987a914493eb04e11 SHA-256: c88ac10bab8a333b9d9c4249f994768aa4c98b6ed24cb9d33f70629f203d8f99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, directing users to multiple compromised or disposable hosting sites. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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://gretajensen.com/ckfinder/userfiles/files/nebijur.pdf In PDF document text
    • http://tdfinalists.ca/clients/43449/File/73156032990.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a4e194d23---97652787206.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/bdc58348b3b7d8427c4b7b24927b00eb/vubalerasufovum.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8193770b2---toxiso.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/nefosekerakinen.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/pokubekifapamizunizejena.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/90874246883.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/luwafuxegavef.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/kakip.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/irgvsioqoq0c9g99p35vs1f096/4277451332.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/prs3ksp0krqmf3drnm343rub2c/24435947280.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/88b29c3b7e5cb90d559f105bc9853b71/zuxozujekemurobev.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/479197c48951a4cb52d03bed0a35f169/wenadonagejexojapu.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/narok.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/9is69i7lvccbs7ailnbf5mgtn0/gibidesurajipejimapot.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/21f61203d9a14f2e7b2d703e830af4a1/runododapujavinusig.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/12ef67bf34148efb1a0f594476a04005/42029098268.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa1412379---kowerizenuwi.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9655d5816737bc2f8d6ecb03ee2bc7f2/zozajupokemiwejaved.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/538ce5005c65f33649f61e3679be4e26/29996287263.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/rubizutugoz.pdfIn PDF document text
    • https://dm288.rs/slicice/file/98593011168.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bf9e6a2dd---65869942481.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/5ba6a508bcc45bfa166532dee039e39b/wuparosewimi.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/96075500889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+turn+on+keyboard+shortcuts+windows+10PDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 11116 bytes
SHA-256: 56c206edcad5ba97f8b8244d8e78f9918879ccdce3de255eedcc2cf60a1a4611
font_01_sfnt_off000111f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A05 18496 bytes
SHA-256: 4f92aa5248ab3173aad5c6315e0b9ce742c0843eeaba3f74d9d70f5a276b2633
font_03_sfnt_off00014722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14722 17072 bytes
SHA-256: 7a5b9d96a3a83b56f8b64ae7ae50de82860bfdf6b284c0c99e5c524010acbe04

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