Malicious PDF — malware analysis report

Static analysis result for SHA-256 1068c668ba7c95e7…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 16:48:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10f3037f2226fd48634c4862830c6d89 SHA-1: c8c0314c3c8e99da67ebe5495db047ba18de2f27 SHA-256: 1068c668ba7c95e7bebf64728e3974dde35e16476dd68f3b3b2184a63edd445a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

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://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/000439f3d4c38ed630e30fdbd82e871a/5919401143.pdf In PDF document text
    • http://dlzj.net/upload/files/20210714111748231503.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8362fa04e5b051feb8cf185ecd6a0651/57208862843.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/mqs1a5lafq45v7ht8o171p7eij/wifewijebelodujeba.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5c287046---45941000408.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/88323882526.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/kobafitomaza.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd8aa8b47c---feruzifoxenukamut.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/49854064712.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2fcb20925---17487287456.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/82432957308.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088336fb00e0---91875444823.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/nufixuzuko.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc04ae8ce---sivejejasis.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/3c4bpj7bv6oflb8qhtaprf77s9/pilawunagawanobe.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161291e3e0db17---48769266152.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/sunipesomu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a565f1abacb---makivaralejuvijanal.pdfIn PDF document text
    • http://ipllaser.in/uploads/93893038271.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f12046b31e7338e312c0dbc31c99c98/bumosakotivakukob.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210703090506.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e1985e225---vetij.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/etpde8q5u39b7vs21jaipdr59p/dadazeboxalifoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=family+relationship+names+in+tamil+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_off0000e15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 10856 bytes
SHA-256: 961db5af942346d79a68393bf05d352c9ad14db8208bd2c43b5e6440c0992c24
font_02_sfnt_off00011246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11246 18104 bytes
SHA-256: 39fd69116e962ae498a51591bf312c1930993aba3c31ec6740093e87f3321353

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