Malicious PDF — malware analysis report

Static analysis result for SHA-256 9192231e9a0615e9…

MALICIOUS

PDF

73.7 KB Created: 2021-09-14 04:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed93e874719d79d82279ed27d7035e8f SHA-1: a6bbe82567d952996bdc4b65b951d1ceef2e5f68 SHA-256: 9192231e9a0615e9ceb66a99751f5c1b01e4b4a056616875c0aea2261aab1b8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised websites or disposable domains. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to distribute malicious links. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=free+robux+finish+obby PDF link annotation
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/mitesa.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/3dd3fc301f626c54b45b62d3fba7c98c/wibujabawomixowulobopivoj.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/wedebaretopixebupop.pdfIn PDF document text
    • https://menu2uplus.com/images/file/zavosipeteniwinojak.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210910044450.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/65651810986.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/90875267031.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/66pk2kncu139gvbk5f3teh35p2/48874829102.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137cb6a21af7---29988422758.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/lefow.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd23bc0019---20605802462.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c45ab76d---31721967700.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/vedawitamirux.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/304335559.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/86419605528.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbc6cc5370---59898630727.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/duvivibodipejonabinu.pdfIn PDF document text
    • http://www.520amis.com/upload/files/94050759125.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/0b847247c78e6ba95a28f8551f72a130/18933243546.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/93465338817.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/wasotojaga.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/tukozaxigipemaburelarob.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613b956f1cf41---zigapabipazesuwusiwuw.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/85025417649.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210906095718.pdfIn PDF document text
    • 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_off0000bf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0D 16432 bytes
SHA-256: 34d8f74816bdfd92f66f2b37f4de0d55e348dd93699d7e1971caf6820f91f29a
font_01_sfnt_off0000e96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10182 10436 bytes
SHA-256: 5a446332c9baa9fc532edd2bc7c6aa4c3746fd3b5f119bc60baabb1240865ebc

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