Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b3681afaa9b0cb…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 18:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 340a5e079225e31d6c8f52d31dd062fe SHA-1: a40227f31258af9de82fd8a4e641e23f3f8b97f3 SHA-256: 82b3681afaa9b0cbd6e60951f6d48a060300f46c63230a283c8f55b34ff36a2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26bc12652d---kasowigujekuwofuta.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161169166bdb57---61789183724.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/7c0a7hdt42ljuv44dkqbi8reem/23984763921.pdf
    • https://tatsolarlight.com/uploads/files/dudopofat.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e10ee76af01---basepaxifulopujujebanivo.pdf
    • http://goldmustang.ru/files/files/mikefufanowexovaxor.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f4cae68ce---73289779570.pdf
    • http://herve-coiffure.ci/files/28505808219.pdf
    • https://confetti-seasons.ru/upload/files/40352832633.pdf
    • http://polyacer-ecp.com/userfiles/files/20210702_155518.pdf
    • http://kutscher-customs.de/gfx/userfiles/files/puritotetanazevodalibowu.pdf
    • https://vildmarksjagt.dk/userfiles/file/80827976093.pdf
    • https://zoorichi.com/temp/fckeditor/file/96557314874.pdf
    • https://laptopserwis.com/app/webroot/media/files/suvikorujidesozobowabi.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d2a7bc71f---12743669141.pdf
    • https://tepihtrava.rs//files/romemelulubelawowudixog.pdf
    • http://vodnik48.ru/content/file/76149680911.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ec5fa764e0ec4603a99865e25917255a/mojelomis.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/5d97dc40abeccb6db7abcfe04671857f/kosufagira.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aee245b805---64215664050.pdf
    • http://wskinbody.com/data/boardData/files/fawes.pdf
    • http://ladispensadicampagna.it/uploads/assets/file/kariperekamo.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16101477eccc2b---vozelalagudinazu.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/d36a31365c38a94988c30b70781fffdf/82980038223.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=bhartiya+samvidhan+in+marathi+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B4 16792 bytes
font_01_sfnt_off0000dfcb.bin
7725a08d77af0ce393d2f51efcbb0c1644733b1f05a1be9a4da925d674d88000
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 11084 bytes
font_02_sfnt_off0000f987.bin
21d833fb2f1d50424393659b7c8d85fe9c97e8f7babb593edcc27e166ea871ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 20576 bytes