Malicious PDF — malware analysis report

Static analysis result for SHA-256 b674aa49ce4e717d…

MALICIOUS

PDF

81.7 KB Created: 2021-08-05 13:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe76e077b1d48c1e0fe90944f8d5be12 SHA-1: 433a2e7c8d1469aaab2b946381ee6c9188488830 SHA-256: b674aa49ce4e717d01d29f5519a113903cdf2b9fd8641dce751950375c7b3338
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous external URIs and is identified as a link farm, likely intended to direct users to compromised websites or phishing pages. The presence of multiple links to WordPress upload directories suggests a pattern of hosting malicious files on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://cructi.ru/uplcv?utm_term=john+deere+250+skid+steer+manual PDF link annotation
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/371rvts1bmbif24gbalvs0hega/basugonutupapojot.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/wabut.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/64775899100.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/rovedowi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607d35283076f---sajareraloniniperuzapamok.pdfIn PDF document text
    • https://airshow-bg.com/file/16590710058.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/09f8qbesmn78erkvcfj0i93go4/semuzowum.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8hvcjukhiefuv2asnbpj0nvnf4/84813832.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/15977039278.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/zunibatexawir.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/katopu.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/45731429638.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/24489214504.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fda500ce1---12376475267.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/jigubujenediguvorinu.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/14956589043.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/79128913034.pdfIn PDF document text
    • https://sapporopools.com/contents//files/zupikolukazinusudon.pdfIn PDF document text
    • https://digbijoynath.in/iisc/ckfinder/uploads/userfiles/files/35533181006.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/na181l1gesk44b3o41ddpo7045/25600749979.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099dd590628b---degoxoduviwiwena.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/oaa57lsk1605dovkiq6ahr70ke/pominavab.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/52425daac96269be791b98b4900fc90f/54267867698.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_off0000d577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 19584 bytes
SHA-256: f797fcdcdcb6f9c0fbc384203de90cf1e0e6f88237d5dd8c2ab224f482f241ae
font_01_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 11072 bytes
SHA-256: 9e0cd1e6081d0a6e983ae73162d629c872b7a16e039a71e06c412063f034223a
font_02_sfnt_off0001208c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1208C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1