Malicious PDF — malware analysis report

Static analysis result for SHA-256 2de1e10fb1cdb793…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 08:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4073a3594d385ca62b9d045394f5d8d5 SHA-1: 353cf0f7e527072444bd52cdd7f0bf960f65344b SHA-256: 2de1e10fb1cdb793ef6c448b0431e7997aff166d2216a56af018f39bdb064fa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The PDF structure and embedded links are indicative of a spearphishing attachment, designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://smidgel.ru/uplcv?utm_term=office+building+floor+plans+pdf PDF link annotation
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/te38rohls11kav9dvh3vthoqmb/tubugokiretaripipu.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/gokunolopokepopevanile.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/75037229161.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/bugagoweloj.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/98821289825.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874cd478ca3---bobitu.pdfIn PDF document text
    • http://medtek.vn/storage/file/fibufuluvi.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/toxijonutuzopawa.pdfIn PDF document text
    • https://zmiz.hr/userfiles/file/toxamokazefidetenebom.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/buwapi.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f789ac4495---22239615947.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/70967396623.pdfIn PDF document text
    • http://fygl.net/uploads/file/100058576132.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/67d5acfb4fde9efb20c797edf0736e83/87118155633.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa54ccd667b---56991007741.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/zimutudobe.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/50165267229.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/ketuloxexetesenorerogawug.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/xikegur.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb6fb15696---nexemolorafamoxibizomiva.pdfIn PDF document text
    • https://e-room.co/userfiles/file/jazesisatosuluvilasozesub.pdfIn PDF document text
    • http://nhs1968.com/clients/65482/File/lijewebu.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_off0000ce75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE75 17136 bytes
SHA-256: 595ed4a6a7358467ee4796f11ba8c79a6c36f08718a11cf4d93047fba6513ece
font_01_sfnt_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 10964 bytes
SHA-256: 6a4b1edaabd2a6a738587979668abbf3b34937e7ccd24d76301dcbc947830783
font_02_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1