Malicious PDF — malware analysis report

Static analysis result for SHA-256 1381d7aaa2e05bf7…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 02:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 66b4a0010bd18b1f7cd8a60b201a9b61 SHA-1: 54e83bc9c6a3db012d7902cab9528c9658af3b83 SHA-256: 1381d7aaa2e05bf70df7bd3eb52def8d2db5dddf57fbb2b97f9861096cacfc33
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/2ef38f4fd225989bfd0467fd5db1a376/90365706652.pdf In PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/34369554488.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/e0c9a3d7fc28b5ae8bc77122881b10d9/wisinezedunowonilefug.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/nokosirawedul.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/gugomokemigesasese.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca893ec1f3---49835206129.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/08cad9fe5ed673b263a0e88066f7741e/13166873612.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/fajutijigagerajuwiw.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c3cfee926e6---3161313205.pdfIn PDF document text
    • http://nktrading.qa/file/files/navimufil.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dac64929e7---supapamidorel.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f23e68d19---kulep.pdfIn PDF document text
    • http://asfalon.com/__files/file/94635653338.pdfIn PDF document text
    • http://idroter.org/userfiles/files/kuxuzaxinexumebi.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/10673974443.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/xokezudilovikubajub.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/lojovapupegalawe.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/dogijosodewazarowiji.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/dinosawomeroxaj.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/kizewudajukuw.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/62880026416.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090fff4b2fc1---2898107572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=portugues+figuras+de+linguagem+pdfPDF 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_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 19416 bytes
SHA-256: e67826b7e562a375926e71739ab7c1675ff107a2579ac9b7a7dd9b6559cb02e8
font_01_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 10944 bytes
SHA-256: da500bc83d823bea8ff0b0dd9f64b4022ff8f07cf897cd52ff01efdbd96f2f68
font_02_sfnt_off00011e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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