Malicious PDF — malware analysis report

Static analysis result for SHA-256 500258175839b968…

MALICIOUS

PDF

89.2 KB Created: 2021-07-02 07:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c87c7052846ad5b963a550997759405 SHA-1: 1cb05cbee9cae2f44f3c6dc531a1647721b3e051 SHA-256: 500258175839b96804993c5aa61a261f6fd949f8de991b3b936ec37a666e3785
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm that points to multiple compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/da569b71094d83828a15ca1e012d141e/faxolijadopolazejuvuro.pdf
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/19bad677bba4a0e76531a337b9f1243d/sokunilerexijaxifed.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078024927b89---kejumovanomejojib.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7337a37e7f---37416333129.pdf
    • https://betenrealestate.com/sites/default/files/file/35579235683.pdf
    • http://unicorn-furnitures.com/d/files/99820755666.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c595332a0---korujap.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/cf42cdf124a13038b1c97f2b6537081d/figowomowarun.pdf
    • http://usaoxin.com/userfiles/2021-6/file/pikojujuz.pdf
    • http://chromavials.com/d/files/63340684255.pdf
    • http://kap-group.com/ckfinder/userfiles/files/dejudobetitadurasotoxovox.pdf
    • https://abe-rdc.com/userfiles/file/melaz.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd1538d08b---5142650167.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609c96a0c5035---13817232686.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/jatepefo.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2q4di2g553jbjlpif2kdpim50c/94310387833.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/bdc165d9c028721c3686b3eaf462989d/dedude.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/avfb98d514kvh227nboin3udm3/sirizonakir.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078b241ea65a---sudedejefije.pdf
    • https://mygoaltv.com/ipp/images/uploads/files/28409224809.pdf
    • http://global-insurance-broker.de/downloads/vesidipobiwavorujufali.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4daa3d94b---49927212558.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=vomiting+phlegm+in+the+morning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbf8.bin
ea1aeda2a4614f36e10eed85e74f9604c6c5dde89996b0d9fd239a3c5fe2b92e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF8 17136 bytes
font_01_sfnt_off00012860.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12860 16792 bytes
font_02_sfnt_off00014077.bin
e08c60ec1f0169ed520e7d0adb8b210a9c525747fb626553a677838ca49dd630
pdf-font-stream PDF embedded font (sfnt) at offset 0x14077 10340 bytes