Malicious PDF — malware analysis report

Static analysis result for SHA-256 1254838051c1b8c4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 03:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 760c13bd91f2f440d8b6cdf947679569 SHA-1: 1b3adcab87c6326186ccbe30b6777a6f864924d0 SHA-256: 1254838051c1b8c4c7681966ec0a6a0c5463e8a5f7254d2b10d33e05432823cc
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, several of which are hosted on compromised CMS upload directories. This suggests an attempt to lure users to potentially malicious sites for phishing or further payload delivery.

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 http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/9d54ae876192a9b817e56aefe8ab061a/jetalobefafovalelizujoxi.pdf In PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/rifodeb.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/kebiwuwupudatolapodu.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/39943209118.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/8779d7e93830207e40d76ccc717dc037/ziloveporeze.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/pokut.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613275bf74638---mazokazezewaxeduberekos.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/tobexefutegojame.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/73977337631.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/40217234680.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/guredominajuxibetisu.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bdb860b49---25987331835.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/dixanefenux.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/xowituvotewizevito.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jadakor.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/nubunikosuzabarapo.pdfIn PDF document text
    • http://yejida.com/userfiles/file/pazimasaxutubijobo.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ce154h2plbumg8gpo0frg4ndbq/jabozigubenofed.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f2b6f2752---4661006620.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jewegosijurekirezajeli.pdfIn PDF document text
    • http://olympusflights.com/files/files/41196720186.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/pasoxuvege.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/fuwisinafanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+set+a+moving+lock+screenPDF 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_off0000d86e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86E 19328 bytes
SHA-256: 378419f5ade52abcc255e5d806d140c499f3b31b46993e63dd89745618740c2d
font_01_sfnt_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 10808 bytes
SHA-256: e572988295f2ef32b2da82d624038a6f17f9e8870f6f9c3115e58b181f5f4828
font_02_sfnt_off00012338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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