Malicious PDF — malware analysis report

Static analysis result for SHA-256 129a443caa33dd40…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 06:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f6c79e3b8a6bbfdcf2c2d14f0d66c1d9 SHA-1: 5f563d18b75957eda1f7a27d541180a5f8275208 SHA-256: 129a443caa33dd405c043cac872d17c16bfac5a3df4d404e855ee5b5e668f9fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/kilorikubawonanisotodebak.pdf In PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095b6989b800---89085503110.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/letowekixujinogifax.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd29ea331---daxifepifug.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb16c3cf58---vojikawa.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/wuguderusakikepugugej.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/posuwinobafu.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/8277710100.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c6194c8679e22ce3bded58307d57e9dd/38609526945.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ef10081f5---83952077119.pdfIn PDF document text
    • https://dm288.com/slicice/file/37594955526.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/fm5l45rlscnftp1h7g4kvkclrs/1365565806.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/66066623737.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/38122533611.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/68b2eacaebfc2a830af4d097c89e9b08/vedamido.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/92901000176.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72126253c5---vipabovixolikekojejiwu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609313d45069e---walexulijovilula.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/15f0f709575723cdd94fabe1de63d16d/94045728117.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/26362029943.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/derimepifitapaluwawu.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794b4c99633---40292759424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=download+free+pdf+reader+for+windowsPDF 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_off0000d858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 18136 bytes
SHA-256: 7c29cafb6a8c6b13b681d60b893f0970aba815df014ea316b6ae5802e5237f00
font_01_sfnt_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 10480 bytes
SHA-256: ccbb3b1cbc2950e4f01bc0184fbe906545659159809b36c4b56fa35babaaee33
font_02_sfnt_off00011ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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