Malicious PDF — malware analysis report

Static analysis result for SHA-256 9effc13888edabd1…

MALICIOUS

PDF

73.8 KB Created: 2021-09-20 13:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 87d0ad65cafb3f6fb343a3aec4dd027a SHA-1: 09349a61bca3ce5088501987d930051552f5419b SHA-256: 9effc13888edabd1aae561f03b8dff684471cac6d06b8e316d98ebf4794ea997
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or link farms designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting an attempt to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jmtours.co/aym_image/files/depexatofadomijuzip.pdf
    • http://www.drivingschool-brno.cz/files/files/xumoradabizamugolizima.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16141d07e49097---lupodalolaxokejalojimev.pdf
    • http://strelnicebudejovice.cz/userfiles/file/50646650487.pdf
    • http://vipnjl.com/userfiles/files/mowemirofakulorevad.pdf
    • https://leuphuotcamap.com/uploads/image/files/39773374509.pdf
    • https://bd-sokolovska.eu/userfiles/file/rijowafin.pdf
    • http://kotolantopeni.cz/file/31481500693.pdf
    • http://aarogyamedico.com/userfiles/file/falodewalejafizisixiriron.pdf
    • http://chukysovin.com/img-svc/files/sanirezutukumi.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613413e47fbb1---xixeretupogiv.pdf
    • https://topconta.ro/userfiles/file/12425928377.pdf
    • http://bilateralmatters.org/userfiles/file/59660394180.pdf
    • http://blccy.com/userfiles/files/dudebelam.pdf
    • http://4bx.pl/public/file/lamimedolobatepeba.pdf
    • http://agriturismoilnoceto.com/userfiles/files/88203323860.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b90bbbe96---87613956718.pdf
    • https://muratay.nl/userfiles/file/66689661200.pdf
    • http://lnyuanzong.com/uploads/files/20210908225730.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/2633379958.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/21583519800.pdf
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/mojizeb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=movies+free+apk+download
    • 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_off0000bc14.bin
a8737639377ea39be089f552191ac8006b194a895aab6534e04e07c7213b66bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC14 17324 bytes
font_01_sfnt_off0000e920.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE920 16792 bytes
font_02_sfnt_off00010137.bin
2049111a20b33c60d507390030e4f3881e334142d408074255314da83112ccd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10137 10628 bytes

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