Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ba82ad46a960c6…

MALICIOUS

PDF

76.4 KB Created: 2021-09-21 06:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96586eb8dbd4f5a083bbddae2faa1d39 SHA-1: f74abe6ab86feba25edea6da04838946c01266d2 SHA-256: a4ba82ad46a960c63e85d8e1d8cf51bcc21b994935c53e6041576b16ffcab485
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the nature of the document as a collection of links on potentially untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=o2jam+u+apk PDF link annotation
    • http://wideanglepackaging.com/ckfinder/userfiles/files/nezodegisalovub.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/57749772942.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/72314506708.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139053caee7f---14174825541.pdfIn PDF document text
    • http://novichiha.ru/pic/file/mokarexaxevilepa.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/7442315115.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/xegowafebebupumasuv.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qqur3psptv3m5uu86smte2mcnm/xesagagatug.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/32700366622.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090903054570.pdfIn PDF document text
    • http://szwygs.com/upload/86473543995.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/22104891264.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/90374285871.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/74772534569.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/savilekatidabet.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/15310484794.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/fumanum.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614878708b1df---xinowalifofegivexi.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suzugadifizidonokisajux.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/83904052362.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/78147190950.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7pv9gp056u1qj5stoclkbmvo2/gidojemixojetudidajanobov.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9717m09u43ogaf98mhesimptm2/73871092575.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/vunudejibe.pdfIn PDF document text
    • https://eventaipei.com/upload/files/kexasevikadululolu.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_off0000c778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC778 10020 bytes
SHA-256: 55c0bf4aa0d1b31ffc9bea6ab28a09f5c9ffe79da630ce86eb47191597c1bac7
font_01_sfnt_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 17956 bytes
SHA-256: 0b99b32c30f47e73e189fca84246c47ea0152658bc7322bde857fc94a99cefc0
font_02_sfnt_off00010bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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