Malicious PDF — malware analysis report

Static analysis result for SHA-256 84883638862ee0ea…

MALICIOUS

PDF

90.8 KB Created: 2021-09-09 10:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f222f540d6067d6e71769758f6ae718d SHA-1: 556c772abcc68e4c3798103715bee9be98aaabf8 SHA-256: 84883638862ee0ea6c71d697ec0d31ec6fe8edfed438abe1dce33240cffb429f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external resources, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass security filters. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allytemp.ru/uplcv?utm_term=simcity+4+deluxe+money+cheat PDF link annotation
    • https://techinnsrl.com/writable/public/userfiles/file/42330898296.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/samorobonapipom.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/bikixuna.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/434044884.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161351542f3aac---50855683919.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/92848444642.pdfIn PDF document text
    • http://cichanski.com/Upload/file/39534563570.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/rurepazeni.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b667ad30c---novirotimagaguxi.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/88036310153.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/zobatejilegin.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161395cb4a467a---zuxowugob.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/ralagokakime.pdfIn PDF document text
    • http://vecsecity.info/editor_up/71632620141.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/42648646431.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/rufufiw.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/zepufawivokolafivowu.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/83550961454.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2d20b2a7c283613a1539f4b1e1090f64/suvibenakowipinibepaje.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/38756100743.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/gofizetixoxota.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/riruxukuwegiwubamepomu.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/renezagurebaz.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/janipu.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_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA2 10836 bytes
SHA-256: 4ef8e5270b7fc34ed6251d8cb448216a7c0a05119dd52b764102c989f773b5b6
font_02_sfnt_off00012880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12880 20252 bytes
SHA-256: f8834089989f1c1cba1d63157e3651b63fa383977d282e67a9e07737da675451

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