Malicious PDF — malware analysis report

Static analysis result for SHA-256 77371005cdbf91f3…

MALICIOUS

PDF

82.5 KB Created: 2021-09-03 10:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e7d526377e12d90ca4fba778b99def32 SHA-1: 0ff6796aef2bb9aef5cf41c59d671dc351956cb7 SHA-256: 77371005cdbf91f3c2a571ff3fcbd3d2dba6c5e9decd1ef377193ce6ee010f87
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of 'utm_term' parameters in some URLs suggests a phishing or SEO-based lure to drive traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crysiq.ru/uplcv?utm_term=wiat+iii+scoring+manual+pdf PDF link annotation
    • http://doanekeyes.com/userfiles/docs/nugeweru.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/fbcc88b0fed5b8299cc732fa39df7b09/junaki.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608843a08689b---ratofasa.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/11720637396.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/kefesonabexev.pdfIn PDF document text
    • http://www.moyekolodin.com/files/86406165449.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/jusadabiforixavofanimomej.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/40379603561.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/cdc512db90fe5cfcbf2756bed7c43967/tazoxodusotesasuluvivuv.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d1b0a0f9a---dajebazilonog.pdfIn PDF document text
    • https://aedwea.com/upload/foto/90192191430.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/siziwowe.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/19978007633.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/96910659382.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/sadufakiwosapaw.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9d8237cbc2c0408756ce904ccedb5192/vuvunimozumopufujawililot.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c70d2627441---fozogimeranib.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/71681214462.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/71128150775.pdfIn PDF document text
    • http://gnox.vn/upload/files/46347110516.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/gelakunareredi.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/5512888380.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_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C5 10924 bytes
SHA-256: 06423c1af92aadd1cb33940eeb4f6d322ea9607e08a27a8354b1d50fc48fa257
font_02_sfnt_off00010ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 18268 bytes
SHA-256: b65b6509ebb394da4ad922eaaa9824dc73d811eb01008e82d5d2e9d3c0bfdec3

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