Malicious PDF — malware analysis report

Static analysis result for SHA-256 e00e4bdc1bf6f438…

MALICIOUS

PDF

150.3 KB Created: 2021-07-03 00:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3a0c34849cd91948b46242c64fc0dae6 SHA-1: cd1289567adee88e4a8d2aeeb764bab60f38c85f SHA-256: e00e4bdc1bf6f4385d5c228f3cd90a6175fb50fbe7622280df8cbf9ffacf6d6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f3d11f558b9a09fe2e4e9cedd45d5a5b/45182984923.pdf In PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c37d91a5ebd---jaremajumipojozurikuxexer.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608254fd9cc44---62864339700.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/80f36896d8b86646446edd7f90206daf/popixetixuwedape.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/41648878604.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/3iuub4hkge9927q2aphgbcocs2/36160389697.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/dd5c43b347dcca5dde8a91f19773a5c4/99234624566.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d1c63602---finerodiginumum.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/te34i75pajis1ooimtmvtp6ff2/68959866229.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/c7555ddaee581ebf034c738600767b10/ximomavel.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/lurabolesenabuvavowin.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94bd0baa6---gobofebezosujomomumolepu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/4581c95c2605e03f4cb62d23308d019b/dujubaba.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090c55fe4e5d---wokufedixuvuwixesegamur.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764c030518c---vuximevutesuzigefezakax.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/f3af29e94dd8891d6cac1a830fa74b06/26111610748.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/n2p01s8i3u81er5htmv262lhc0/woxibagakezinowuxev.pdfIn PDF document text
    • http://cissi.it/userfiles/files/mopilunevevaragugagijuzeg.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4765c0503---wurumesuzizevek.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e019d470ca8768efd6bfb48a0976e4b7/37782478720.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/pisoxajol.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c0087c296---71391084333.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a68884d5d---69605159362.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/fenopujimufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=asset+forfeiture+lawPDF 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_off0001ecf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECF1 17796 bytes
SHA-256: cc0c8f66aee6a6f8be76eeeca9063f71753573d99f6bdf578321163408935ce6
font_01_sfnt_off00021c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C29 10272 bytes
SHA-256: 15c2715b9a837de2984b1ffb3685ef45039f3f07ad7ba4bada4a24473d6e3ca7
font_02_sfnt_off00023389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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