Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26cea7560264f0b…

MALICIOUS

PDF

85.4 KB Created: 2021-09-11 13:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba8e0f8dd99cb025c0123285bcebba10 SHA-1: 4e3836d1ee877368fcee8163308d4dd220060f07 SHA-256: a26cea7560264f0b60ed368ed0f879ccc14a2e0d490e7f5603cb1649b29488c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristics strongly indicate this PDF is malicious, specifically flagged as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=orient+action+32s+price+in+pakistan PDF link annotation
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/80677210140.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/gisufiritijod.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/fobitosebuxojuzuwojes.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/febesodubikeneriz.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d04fc9a01d3d79b54a8cfedcc5633707/92203000628.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/lirupujesokiwosarepex.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/25786257158.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/20713574619.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/pagato.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/78163467969.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/63472148310.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/nurolafejipawekamov.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/xozolutuxaxafadigona.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/8971820966.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/079238033e113ee028c8190a77149225/67892395075.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/97439166323.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/tukemofefot.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/savezuwuropejaxen.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/josebido.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612f333d5ea0c---87288429241.pdfIn PDF document text
    • http://lovesenergy.com/file/14407382316.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132e3d1eaae1---84453520865.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mg2jqu038sgaookmnodu7pb0fc/21570183121.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_off0000e6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE1 10732 bytes
SHA-256: 7530b6537a17b88a052ff65ce604dcaaff6312e1b7ad5505937ddf775d9866e1
font_02_sfnt_off000117d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D0 17752 bytes
SHA-256: 30067a55ca0ed2017b4ce82fedc2f3570f359f4089a536492c2e54e59b0e4d04

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