Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d82d56f62f1ccb0…

MALICIOUS

PDF

89.7 KB Created: 2021-08-05 09:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 83e5a7824f5e26a239e2f058c0ca09ac SHA-1: d1904185eed84f5ab3bfa6f00f90e4c068ecad4f SHA-256: 8d82d56f62f1ccb0d68cefdb8ac8c445782e3763566cb0269e63f4da0e25e0f8
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to disposable hosting and compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://archism.ru/uplcv?utm_term=museum+of+dream+space+%28mods%29-+las+vegas PDF link annotation
    • http://thucancakoihikari.com/luutru/files/fizaw.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/81627747940.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/xotefanejisafowobinege.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa4d625d92---nuxagikekaxizevesetejozi.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/zupajobo.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c67aee0dfb---43875611979.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/rakasivodabibezovobog.pdfIn PDF document text
    • http://www.leasebridge.com/CKUPimg/files/zudositegajotogupotub.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/5nft887fp1hbnse96j8ib3ord0/1176775995.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/2eadca56868b582bf3f8e181242b932b/goduropumowirudusi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1d5b46304---10013290131.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160e28cdbe82c8---ratatijisosefotozarobam.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/93013801028.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073928a69a31---34139872117.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/waxegokawi.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/rabepijewa.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/ffc5d776b9885ca412ac7a6a752fcd16/mupezivuxegoba.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/defaguxibarikugozagi.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/50657391925.pdfIn PDF document text
    • http://lakesideterracecondo.com/clients/41361/File/bunufojenasabiwinugun.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/pd9onr4jm75uc50ru5msuh47t0/pegozagemelipujad.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/49272bfff2e601fad42bd3b2a0fd0bf0/xegir.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/21418304798.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f001b7d81b---pibaxovodezoguga.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_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 11020 bytes
SHA-256: c48a3634bbb02d1bb777f675a7400ac8289f1bb47430534ead66d4dfbd89cfef
font_01_sfnt_off00010f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 17936 bytes
SHA-256: 459a100885851c4643c552690e0cced4c0bc550e8b9123b25e9a6c4a3331a1c4

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