Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef95ffc7b0f36f63…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 04:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ace8eed68ec6701f9011a6ce89667ea SHA-1: ff5684c120282a75a3260b68a827bc84955c5839 SHA-256: ef95ffc7b0f36f630a9a34839ca3950b3da905c2cd9893592b3fadf2c8b31426
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to potentially compromised or disposable hosting sites, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content, likely involving JavaScript execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://makiriaszto.hu/ckfinder/userfiles/files/98498078874.pdf In PDF document text
    • http://agcslohian.com/userfiles/file/63045496386.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/73078401968.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/70504890033.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/92309763153.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/40137889686.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/62524238303.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/14e27dcdebb2468b78257205b88370df/88221166266.pdfIn PDF document text
    • http://debden.org/userfiles/file/rekedodejixelugupem.pdfIn PDF document text
    • http://maydangson.com/vietkiendo/upload/file/72127092106.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720427bfc2c---kixuxuzevuzapunabexukef.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/63346573604.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/kt4r151a3uj8e2btgqd6v9pjmk/sulaladi.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/f7e92cfe182aa7e6e4f17e990fdf629d/fowikut.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/rasomovuwepakogena.pdfIn PDF document text
    • http://studioghittigargnano.com/userfiles/files/jidazikanivokex.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/28446cff41684beb85603ce991e03a98/92929571595.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc71ea0a001---saribevixobam.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/81ofp109b9kp8i5j31mh5j9d7j/74026869633.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/72537934347.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/23087331143.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/7363807100.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=modelo+biopsicosocial+medicina+familiar+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_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 10816 bytes
SHA-256: 3240b3793984fd27d0ca729efec4c682f42b9936b725f7bd156f238e603d1cc4
font_01_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 17036 bytes
SHA-256: 1c5a69bb5b10d366e9b1184dd47eb62bd363effed7a0d0b41ddb78175be9fc28
font_02_sfnt_off0001241d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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