Malicious PDF — malware analysis report

Static analysis result for SHA-256 9267ed78388807ca…

MALICIOUS

PDF

78.7 KB Created: 2021-09-07 08:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e1a3567470b2f8f4c6b302ac9afe6f43 SHA-1: a98e06096910d8f0d2b13deba2231870f184a5a2 SHA-256: 9267ed78388807ca0536c8ac242ee53c68adbfa602dde304052de8e71cc33bfa
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised CMS upload storage and disposable hosting. The embedded URLs and the nature of the heuristics suggest an attempt to direct users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/pvib5tau24ibd257r3c4i0edn6/xuxoxurujovojotilojoz.pdf In PDF document text
    • http://francescofesta.it/userfiles/files/selomidivotadegavi.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/43751995532.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/53592071546.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162697143353948560892.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/bb9797a77ee6e3e52629ba000f386e01/litenupivefoniw.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gawisekef.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/18453923625.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077542913455---40095245396.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/67582493201.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/wixetonisamoxudike.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/63791680914.pdfIn PDF document text
    • http://compsult.net/userfiles/file/sexufatipal.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/56158479216.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612382036777e---maropubapowojuwem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117f69fcfee2---noleri.pdfIn PDF document text
    • http://k1a.ru/images/files/file/pegesu.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/tamaperatoxewafuvojoru.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27e0bf3b23---62385561412.pdfIn PDF document text
    • http://novichiha.ru/pic/file/mesubak.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/83773313616.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/67358582294.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/2fec554fc4253e1d3dee659042ac2e54/48636190989.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085b11f16635---zasagexideregew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=repeating+decimal+worksheet+answer+keyPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB77 11296 bytes
SHA-256: 926c8721225d3978f7194f272cc157726d4aa697c8b6436702c5e11ed43050cc
font_01_sfnt_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 17728 bytes
SHA-256: ba428c2f54eef16ea040dc2709efea4cc905ec7eaddcff3d8355717372a517d7
font_02_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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