Malicious PDF — malware analysis report

Static analysis result for SHA-256 b06e3398c97dc46c…

MALICIOUS

PDF

98.1 KB Created: 2021-09-13 00:26:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 840f0b3a7bb4bbde56ce2926d661cffc SHA-1: f34a9593d8e17a28d07c9ffa71d13e90ce48def3 SHA-256: b06e3398c97dc46c823e239a8e444144725bc4a5223de4325013edfca3012ae3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The document also features a large number of external URLs, many of which point to compromised websites or link farms, suggesting a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=walking+dead+season+4+android+download PDF link annotation
    • http://www.premiumimport.nl/ckfinder/userfiles/files/66123683800.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/5234127971.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/faloz.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/62781153917.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/nijaganir.pdfIn PDF document text
    • http://besteva.com/upload/files/suzibejan.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/rizuvaduzemujovov.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/34296114760.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/5232196261.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/fiderakafenigakekar.pdfIn PDF document text
    • http://metzlerranch.com/userimages/68163598885.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/mijuromotodef.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9c590d1d---72035523992.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/37837618093.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/74400327330.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/46806195612.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/rakezesazebovaweti.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/xenetabuxowakem.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/977a87c577a1149d32e504fea1b08062/kezudomutepane.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/15125429858.pdfIn PDF document text
    • http://megalaserasia.com/upload///nujed.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/nalijonumojusekowumavi.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/potoxuwavudolonatar.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c458fe9a0d---87724150242.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_off000119a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A6 18724 bytes
SHA-256: 6df8590fd6d3c61ff49ebbe7e6c027b2461f673926d7785f679b3599bf88b315
font_01_sfnt_off00014a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001628e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1628E 10576 bytes
SHA-256: f6317f856c2b063bf82e9153d6b654e3ea4f1841618aeccebea6d4c1266c90bd

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