Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8515806fbb1fec…

MALICIOUS

PDF

81.8 KB Created: 2021-07-24 23:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b0d7d675319f5f9407e77615082870b SHA-1: fe2f1d59b2c2eb5fbc42f0b050e023a4997cbc54 SHA-256: 3a8515806fbb1fec7d9e1036cec9b9d2a00f45a5040c47d44ea7f5e75fe476b3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881df3601f2---39993013881.pdf
    • https://pet-fashion.ro/mm/file/76809137649.pdf
    • http://degrossier.nl/uploads/file/46537513102.pdf
    • http://soflocops.org/clients/83264/File/74738468381.pdf
    • http://limoride.net/gallery/file/18798093431.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/mavoribanez.pdf
    • http://www.deopendeur.org/imgUser/file/48565448283.pdf
    • http://kme-kme.cz/files/file/zaginuxedanijosaj.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/j5g0fbn3ev8vvbhjmjkl1vo81c/50195135247.pdf
    • http://alexlunacoach.com/img/editor/file/tosasatufelof.pdf
    • http://aihyang.com/userfiles/file/bosezesokebadumizapi.pdf
    • https://isosklo.cz./uploads/88070147184.pdf
    • https://mintowncoffee.net/uploads/images/files/36517869697.pdf
    • https://mariellatriolo.it/public/file/zarebawubovizuzafefugeri.pdf
    • http://mobilesamara.com/img/files/file/38568462500.pdf
    • https://ambient-interier.cz/files/files/soxatu.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/432a9e07c836d761dcaecafdc9883db0/wepulofirakesixoza.pdf
    • http://creative-format.com/upload/editor/files/45916755456.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c36103c37---muturevavekik.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3cc437cad4c86de3918ca520edeee41d/xusowakoresasituwepa.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160e042265f18b---74701929364.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160876de9868d1---24274083236.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ldc+question+paper+2019+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 16792 bytes
font_01_sfnt_off0000f3dc.bin
de1111777e97de18c757fe8873af58e975f990f40e52eb5bc5ca7df17ccd941b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 16504 bytes
font_02_sfnt_off00011ecd.bin
69515f970c9224d8312d57b09bba7cc70997bc6eda363c619367e009384d62c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECD 11232 bytes