Malicious PDF — malware analysis report

Static analysis result for SHA-256 979e80dc1d7dad2c…

MALICIOUS

PDF

89.5 KB Created: 2021-08-20 14:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec9db0c1a332ce48d334fc39909cc67c SHA-1: 0b58eb8deb05ab548f9044e6eb07822fe7582e6b SHA-256: 979e80dc1d7dad2ce157f729387525030e3eb784b475c59f480deabaf006e694
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, likely to distribute further malware or phishing content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

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://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/h21fat0i3f3cmul603dhdbiu4n/tugejasixejifidoberetaj.pdf In PDF document text
    • http://www.toptehnik.si/images/67741349488.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec51a30492---firitavadapimele.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb91a7b326---sotifitiwo.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16085d4915ce47---62390630509.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/soxobe.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fc498dcbf---83240738836.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0a72379de95dbb147fb2d08c26a6f8f8/5204434912.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/74907739545.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/dasujibetixofeb.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8507e8928c---zotevekadevaja.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210530212848.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/eggrr2are3iqehtpl14bbrjhv5/lanajuzenolubaduk.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b937e3aa84c---47234798178.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wiwovak.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160909252778c4---rifiwatop.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/parukorovunikin.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611da5726f333---79874633324.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f50a09cfcc---6033153362.pdfIn PDF document text
    • http://abwessex.com/uploads/files/97034344051.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/81690597297.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/veburoxof.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/xejagele.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/8bb2575fc9640d4fb3d1de0a3cc3ae33/vizirarobazupuvike.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/labopumifokavateg.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1b4c1472---30340070461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+setup+amazon+echo+show+2nd+generationPDF 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_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3D 17688 bytes
SHA-256: 086597a7d8772da5b5e6ca129fc67aa60dbd9ee8e28ac0d22873f9499956ac7f
font_02_sfnt_off00013dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCC 11272 bytes
SHA-256: 360125ecad1f4bc1d6923be06542af14e5a45aa5070dfe451ee13c10ebf11c42

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