Malicious PDF — malware analysis report

Static analysis result for SHA-256 393e698763710c91…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 07:34:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36121a021b65d5c6d9839684a4ab85c6 SHA-1: dadc40ba4e9a1f13f57d7b36de9f77427664613e SHA-256: 393e698763710c9177170a1532aef2c65f78ed99826362bace9b52bc5b9d2928
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure, likely intended to trick users into downloading further malicious content or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=gathering+blue+lois+lowry+pdf PDF link annotation
    • http://biosite.ru/images/news/file/31786274154.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/43208603740.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa7fbc85c7---5889580204.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135c9528de3c---62552281499.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e120a90114---16921522902.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/84255925891.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/xevuwewe.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141480b7a05e---xufaduxifurejewezosolafax.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/falavozutadeda.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/xolufokigesajajijudisixob.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/30631181848.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/315072556.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/25828993219.pdfIn PDF document text
    • https://phukienbep.net/media/files/27451622124.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/23662064169.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/2255208631.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/mufipasamisimaneso.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130da1564a63---34133464110.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/xopibagad.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/18331496419.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/73874272168.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/powuxaximinipinukafit.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/gubemaluvarinata.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/mufogimuva.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_off0000ebcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCC 11256 bytes
SHA-256: 38890ef10f04a8b763b12c088b7fe6bc9ee836ca8d6199c98b7ebc9ca1e65196
font_01_sfnt_off000105ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CE 17032 bytes
SHA-256: 35f94790f2a8d38ed294f818fc4abce08118740d7d8bcb37ac8af51f4991a696
font_02_sfnt_off00013223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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