Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e9f4562f0a8a39…

MALICIOUS

PDF

81.2 KB Created: 2021-08-27 01:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 762fa9373be8e7d64dffeaec3cbbefaf SHA-1: d5fac0930b88f2c0a38759a00054e357ed6f6aa0 SHA-256: 84e9f4562f0a8a39216c09a3b72f8304eefec75552f14087ef15aa23c17c0f84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of external URIs and the link farm structure indicate an attempt to lead users away from the document, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://archism.ru/uplcv?utm_term=how+to+cancel+additional+icloud+storage PDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900c10df425---75442735735.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160beb5176e401---24279405811.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/77459285970.pdfIn PDF document text
    • https://diphong.com/uploads/gilulemunezutumamegasopuw.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210730/210730045510419395waypzkc85czi.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/sitolipifumewuziri.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/7pj4m0psdc9v64381ks84nj7ju/zefek.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/83139262425.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/duzipepomamobabufemor.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/33348685318.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a9aa4ed0cc59bcea0d380440cfc8feff/toxuvasive.pdfIn PDF document text
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/kogepunezam.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///24230792624.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/dijaranutagoz.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/gowekakokufokukefefetim.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607954d2ba8db---nokemik.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809d9473079---meloton.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/lapenoji.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/piparuxetagotu.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/menikalipufib.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/rumijadesogibezixamij.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/12997778815.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/golofomimapabowuribowixa.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/54d1f0b53ccf99c496150069520752c2/tamadugurixisuje.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/98500627612.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b994418c564---44201263381.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_off0000dba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA8 16092 bytes
SHA-256: f9f51adbe033313e1710d7dad4f60a1ccce28a689778a90fdd4952e65a898654
font_01_sfnt_off0001050e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050E 10720 bytes
SHA-256: 06f90c935cacbbbe1669bc683d4d1935bbd626eb570d759ff301f55326a36340
font_02_sfnt_off00011d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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