Malicious PDF — malware analysis report

Static analysis result for SHA-256 a366c6bade6b4e8a…

MALICIOUS

PDF

74.5 KB Created: 2021-09-10 05:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b4600c3cb5cd4cf3a3350f221b056d2e SHA-1: 740b4984d1cafbfeec11726627ede2c213edca66 SHA-256: a366c6bade6b4e8aa811668b92cea050f52f319b0748a351eaa7111341e996ef
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and an ML classifier indicated high maliciousness. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The document body is unreadable, but the overall structure and URL analysis suggest a phishing or malware distribution attempt.

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 http://bojovesporty.cz/userfiles/file/xofisirivifimariwotu.pdf In PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/96060969334fc8e5de5a117210879c2a/35727071997.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210907205709.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/metetuxetiburawilusu.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/xisow.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc6bc3d869---sivigujep.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/87112878514.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/27064372686.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/79871307852.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/25698699158.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/biwolabafelofo.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/20725162009.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/pajufosebamiletupasibe.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/xiser.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/974f861f2ae2d0ecc5d25675dea6c7d0/dalani.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/xedefilulurojobabuga.pdfIn PDF document text
    • http://fourfoods.com/images/files/tenusavarotujivopiwefipu.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/gikedekofaf.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/fozujowijezerufe.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/81463785107.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/zomodipafefepeke.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/13477534097.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/49320642276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=emerald+randomizer+nuzlockePDF 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_off0000c1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CD 10500 bytes
SHA-256: 1dbc804a4dfcc9e0b2d95939276cca4def7901263e589fa8f10f54408c1dc551
font_01_sfnt_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 16784 bytes
SHA-256: d651f5fcec9aabcb4e7a1dc8266042ed5e98df7e007b249111578fd65b11f6e1
font_02_sfnt_off000104ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1