Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a79f2bab6c2578d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 01:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b10f1644bf1f6ada09d697038ce3a48d SHA-1: 211c04ff8f0c5443b05ca65e6d41ff4c2df83462 SHA-256: 1a79f2bab6c2578deebe3fad02b51264b02ba44250a48c9ca9cf85c29fba0465
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/0764d186ed83db0092aedc9bcc84aac7/zazipofevipuzuxanupetik.pdf In PDF document text
    • http://dnepropress.net/files/file/5168821851.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/klc272njkg8epnras32m0n63tp/4737616089.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c770779ee7---jixewisolipuwobopozel.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/febuvazufutiwojo.pdfIn PDF document text
    • https://mavibusiness.it/file/zekam.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/xusupotumil.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b6490a221---xibafefexugawad.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e25d764a6f---punupobel.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/12b36bf044043a0ec588fe424950879e/4870698440.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6f53e00d12ad8040bf9e9bd59544180/debawezikag.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/50031191851.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2870006b0f---baxiw.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/14952414371.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/lilogaxoxajobagun.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/24832717396.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/jgfn0a2ippk2u2es7m7kvrfh5s/peneligerinimisezamoz.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/9141105572.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/geduwo.pdfIn PDF document text
    • http://erpos.sk/data/files/vagaserijo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/711724521.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/b63ed9a2c82a224d7960b3f3c9005466/35445861688.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=rani+ahilyabai+was+the+queen+ofPDF 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_off0000cb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7B 18440 bytes
SHA-256: d3ed7943d1faeb63084b5dc3fb9e7c182c631e83c2d1e14de05cbbebcc687dc6
font_01_sfnt_off0000fb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB68 10844 bytes
SHA-256: a9b9a8fc96f0703ea72557cd62363339cf16f9c3b084055eab36c49859d57a1a
font_02_sfnt_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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