Malicious PDF — malware analysis report

Static analysis result for SHA-256 75bcaa6383d35556…

MALICIOUS

PDF

70.6 KB Created: 2021-09-28 22:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbc27d1489e54c664ef9504466e8fc7d SHA-1: 342f77ba7f2629d02473f9d6e23fdc4633ff7804 SHA-256: 75bcaa6383d355566098568c3f273924a7027c8c2d1e660304f6e0e1e7af42a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external URLs, many of which are part of a link farm hosted on disposable or compromised domains. The presence of JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=how+to+change+hotmail+password+on+android+phone PDF link annotation
    • https://reha.bg/content/upload/file/nerijoxilizineju.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/sosiwugovepavegoko.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/jogimenozokelezigito.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/zefuganupagarim.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/jazan.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/46222809499.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/20929978712.pdfIn PDF document text
    • https://expomediainc.com/upload/file/33475830634.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/zetixixedu.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/52360106578.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/lajuzupopowuboderepu.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1612eca6700ae9---xubenunig.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/nebelalorovemi.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/xulajujuw.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/25711648737.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff98b22b80---64045249596.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/kakeburevibubu.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c792a5ff37---22353816419.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/20491228592.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/86341118746.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/97330398054.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/87089316429.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/51706579459.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/dikefozirimuxelirekezeteb.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_off0000b062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB062 11036 bytes
SHA-256: 8a1342b219708ce48bed7f5de6814940cdc365b2b294218b5ea3ff5f4425ea2f
font_01_sfnt_off0000c9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A5 16964 bytes
SHA-256: 5df097912e9383bce1d88f8465a5e86c56b2f7519e0424bd8d22bbe78b386b41
font_02_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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