Malicious PDF — malware analysis report

Static analysis result for SHA-256 885f2e2f923ddc29…

MALICIOUS

PDF

87.1 KB Created: 2021-06-30 23:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 74f3486fcd4bcfb7d1cd0321ade47069 SHA-1: 0cb39dc5086aae130e1cba5d88e63db3ddd06f3b SHA-256: 885f2e2f923ddc29ca07779654d8cc1953c332b0164d0253708ce971a64fa15d
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 as 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. The presence of multiple external URIs and a link farm structure indicates a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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://btcauction.vn/hinhanh/file/31590349035.pdf In PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd01571a1b---pulosetibusubogavosoxex.pdfIn PDF document text
    • http://qzgj.cn/upload/file/povakugixatadexuzutigitus.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bcfc179fd---10507260567.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/80976472044.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/rosawanononotiwuzeva.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4541ec3195580a80f093aae080b60e93/tezatu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609840a43c594---bifodisavavuvukifotovijar.pdfIn PDF document text
    • http://minerva-collection.net/files/files/xetef.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e191020b3---ponexiwifixami.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6943b04d---11430139761.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2c386c27b2a605827f506f6e67cec303/22312397712.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160809efbe189b---12150336168.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c947233b8---98422860674.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d45fb2a8d1---xasiwofuviguxarobogub.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/37024804394.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/pifutemujanikuxumivuxe.pdfIn PDF document text
    • https://efnnma.org/files/file/29321196835.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3ea00661c---muxojebokobuji.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/ruwabifav.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/28u1orkt7r6q86frkceg09i1r6/11064460808.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/zamazuvirux.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/nuzuluwonujewiregosevaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wisayah+global+investment+companyPDF 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_off0000f30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30C 16528 bytes
SHA-256: 29c42687ca19d8e56fd47424ae163e30a6522089e218796af96f6b9871cdb4e5
font_01_sfnt_off00011dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAB 11032 bytes
SHA-256: 465d772c836865b38c9fac8ff09d182864f32b8f514d2ee680cdc3f8d0dfd868
font_02_sfnt_off000136f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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