Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf60a14bd3ac1963…

MALICIOUS

PDF

80.4 KB Created: 2021-08-24 16:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41677822059660996710e2af6f560119 SHA-1: a38b1159c2cc5b9fd893cbb8c7cca6fe5fec0a32 SHA-256: bf60a14bd3ac1963ed7deffd1b571f287ba86e861766111e40597146b2492991
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://nova-auto.com/upload/82460036201.pdf In PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/f9d0fcf1e9948fc5dba50660e49b751b/12151237476.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/fedd95a3ec485f59a965346b04f20491/fizubelaxegisixisesara.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/76873040113.pdfIn PDF document text
    • http://calhi1974.com/clients/46234/File/78413961703.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/bepemijowulaxop.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/368444a4b64e4e66f76ed3cb6d648967/bumalunevawusukorekitazoj.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/d39993077c29ef4957e146f656db4ecd/56076042977.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d38c182e29---votigaputonisifowolila.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608938863b5f4---wapukufuz.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/f3ef2d3c69c4ba2d84484678f146d77f/dilibuxit.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b63bf4c6f3ba8eb7825e7f82f10b1e72/56036573709.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/91797875642.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/62087120458.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/tatifabetalo.pdfIn PDF document text
    • http://mebco.ru/images/file/39523053548.pdfIn PDF document text
    • https://schmitz.cz/res/file/molef.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3c3c9838a---mowekubedatikeveli.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/sirepubewugadiji.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/dubawafenulun.pdfIn PDF document text
    • http://elitvorota.ru/f/file/taxijekej.pdfIn PDF document text
    • http://biosite.ru/images/news/file/28290853357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=can+u+get+pregnant+while+miscarryingPDF 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_off0000d6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D6 11032 bytes
SHA-256: 1cdcf582871d95c8950170a64995cda4104800a359cbb67c2fc3cc11451218a5
font_01_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 16536 bytes
SHA-256: a4feb391c01c8970ba60d15cd7343af9ea1bedf692b5347f509e21645f34598a
font_02_sfnt_off00011b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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