Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8a64ea236fe977…

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 21:25:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d7b90214eca1ac84743c72251e63c7f3 SHA-1: e217bdb713d1a704e626dbef13bcaa9973c5b9fd SHA-256: 8e8a64ea236fe97783acfe2e5714be1e1cc11d4637222e76b73b4f9a30111be8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains embedded JavaScript, which is often used to initiate malicious actions. The PDF also hosts a link farm pointing to multiple distinct domains, many of which appear to be compromised or disposable, suggesting an attempt to obscure the final destination and evade detection. The presence of a download button lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://cesvil.it/filesUploads/file/16331639302.pdf In PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210914093011.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/46973130699.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/29644292085.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b91ba3126a47f590b095d94308a362f2/72855477840.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/64647703971.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613049c83f02d---42272675843.pdfIn PDF document text
    • http://gardatrans.com/content/Files/sokowadimulanipibibubu.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/gomodatoz.pdfIn PDF document text
    • http://mq-water.net/upload/13141006485.pdfIn PDF document text
    • http://kammerchor-lindau.com/file/40325163633.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/tusovipojorosijikajot.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/18d794d4002909c3980469fcd72da18b/gidemipax.pdfIn PDF document text
    • https://jetaime-shop.com/files/zigolum.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/talekusesugibotifonedofav.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/96929247216.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/divodasubuworut.pdfIn PDF document text
    • http://citranco.com/users/files/kuvawukamevofafuzorilem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cute+cut+pro+apk+iosPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 18748 bytes
SHA-256: fdd175dbbfc36aed8812c35b4e4e27c9b33c9ad200d3918b5ff8b3f15c560bc1
font_02_sfnt_off00011a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4B 16540 bytes
SHA-256: e8486dda68d8266c598e955260788762e21e39567fd64c38d8391f70685452e0
font_03_sfnt_off00013177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13177 10440 bytes
SHA-256: 83ee1a26bfa500a1901a25e7523907a7c465632d418da981f249ca339f53e74b

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