Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef8c44cffc91e9c…

MALICIOUS

PDF

115.6 KB Created: 2021-07-06 21:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d53e8b4910ce1ad35926a215bdc2823d SHA-1: ce0adfa749e301239a1e4bff0dc2023eef9714e8 SHA-256: 9ef8c44cffc91e9c65c0df090aa1ccdf5a247a758c3dca86249ff5dbff583de5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure itself points towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

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://drafthe.ru/uplcv?utm_term=state+the+pythagorean+theorem+in+words PDF link annotation
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934fae167b5---17434936349.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/f10b804808389016bb1b78e7cb69aaaa/kidivorixebej.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4d81631258a361ee6266ce154aa075ca/32874523550.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/sawodumipagupejovixof.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/zonodaw.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/irhb0t7pu592g9dl6g3n6qjv5m/71581825580.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08e7f407e1---90568457396.pdfIn PDF document text
    • http://fedime.org/imagenes/kupobarujiwarosubo.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/be48d308e7ab917ffe079df41dffbede/liguwopem.pdfIn PDF document text
    • https://ebooksweb.net/files/file/41275347959.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/godisoxigo.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/dojazitokexelaxagupo.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb45170d166---najubepu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2fe04f8da---radilizotewobikikin.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/f93f966c2ec714da56d1e2c7401efb4b/lelipuretajide.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/73573032832.pdfIn PDF document text
    • http://medi-sen.com/files/files/39360017991.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084561803e82---lamefuz.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf24e05242---sirolosorixezufutifowofo.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/bopam.pdfIn PDF document text
    • http://kfbi.ru/content/file/1638695770.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6afa18adb4e353db7a6641cf9fa9ae65/59313682749.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/72571403169.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/bobuxulupasakarokado.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b47d0f89a---borogut.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/92fd07f8bcccf60e21aad0b5da77fb17/duvigowiv.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_off0001608a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1608A 17892 bytes
SHA-256: 8ac6225555ffbff185bf3aba7b21b7a874192a7bdee22482ca568e3fcf605803
font_01_sfnt_off00018f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F2B 11068 bytes
SHA-256: aaa2aa75dbdee623736720ae3487c2537eb997f5e2416523547524a2e11c8be3
font_02_sfnt_off0001a89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A89F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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