Malicious PDF — malware analysis report

Static analysis result for SHA-256 0560f6dac1f11e3b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 05:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9323b31b1b0d17c16974b5fabc9a17bf SHA-1: 421f2bd8ae3180abe4197fd14c0757e14fd39f92 SHA-256: 0560f6dac1f11e3bd9ed1e10ff531f852ca53ccfd4ce511225ddc7fb0243dfc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The presence of a PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting an attempt to manipulate search engine rankings or distribute malicious content through a network of linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://christopherspubandgrille.com/userfiles/files/53633916441.pdf In PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/15h7kmhbjenjp9tsa33numtpmv/vedidezuxejalilanuxor.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/miwug.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/noviwebojoxawemetexaj.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/62452898449.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/repasurofogovutegupoz.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/21300015758.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/fe6b9a0ba4bb6205cab5db934cddce2f/11496567154.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464d620ace---41891086302.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/c04504be8a6e4494edfe878948c3e51c.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7f18596e7f---59169062985.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3cb39b08512a955a65c9fb54082e4319/xigelupabujegujad.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/difefoselofufuz.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161296ca60c947---manimizisim.pdfIn PDF document text
    • http://kezmosas.hu/files/file/34755656729.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/2321fd9ccc2ba546587a7cfb550562c8/30173677706.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/zaxuzilowub.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/1m8gq5750ecfvbblsbjp81e945/wuzalimizajikul.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/jujoxujobimavaxoli.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16089ef50408cf---53891736648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=diagnostic+des+maladies+auto+immunes+pdfPDF 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_off0000ceab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAB 10964 bytes
SHA-256: 99e6a7ca86810e0d679109a185ea48ad087f5cfc2cdf6c57342cdff73595c525
font_01_sfnt_off0000e7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 18708 bytes
SHA-256: 6bff5717c58e04acb207bacd5e0f30680cadc414023b6f4bee3250213cb87ed7

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