Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3eed3ad0fa4af9…

MALICIOUS

PDF

87.7 KB Created: 2021-08-25 10:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 560cea72953055f9a8d8695772865fb6 SHA-1: bfcbbfd3d2e428a87913ea95510d9d3d85368d2f SHA-256: 8c3eed3ad0fa4af97edbd13becbeb77249244b24ebef76891e3770c99ba22ef8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains embedded JavaScript and a link farm pointing to compromised CMS uploads. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user or download further payloads. The link farm heuristic further supports the idea that the PDF is designed to lead users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c860ffdf5b4---duzose.pdf In PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/hlveomb8fng0qj9rn06f2atcet/35202862083.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/74685362333.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc2e446eefb---moxarerinelekarupulir.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/lonmmgfpi50sevppcq9ltutu18/zuxubizijakuzefarug.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/shpoqm3faieme6duhfctdj56gk/diruvo.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/27009848568.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/5dc44e8b1fcd495f8c5bb63ea9038407/tosugogenuvuz.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160850af1a008c---zubatomojab.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8942ec0c2c763de7c5b7a04898ef742/jowonenupivusukuninuwux.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a816a77e385---8039658612.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/40182209859.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9de96e1cb4---27112880373.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/nikarafomewudawekakaturem.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e4f4f6a4244565af540d4096477443f4/47786566387.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d2aa29f0c---71200630938.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/4732284650.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be305c8f4ff---60949611211.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/kinisopurulikewofukepil.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/sosetekogikajexibetu.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcfa31a8f6---tisowaluruxisogixujorow.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609839172f9af---fubad.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/subatojobo.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/fevem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=world+of+tanks+unblocked+gamesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF246 11052 bytes
SHA-256: 94c92e1e8f0f393c1bf67b6395a06e88da362874d9dd0d3021a6a770f589cd75
font_01_sfnt_off00010bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 16984 bytes
SHA-256: 68795be3df7ba8d1f6ab377e1106ce3ad8e287b8ce513e5286b918b69456c17d
font_02_sfnt_off0001384c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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