Malicious PDF — malware analysis report

Static analysis result for SHA-256 4366fa21d9124cab…

MALICIOUS

PDF

72.6 KB Created: 2021-08-28 06:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2beb86749099312aff25679c68388c70 SHA-1: 0aaa36e38854e4ca774e8abe15b04c439920a18d SHA-256: 4366fa21d9124cab99f0ad69a648a59f4c35bacaf8418dd6a7fd318deb31bbfa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting domains. The primary purpose appears to be directing users to malicious content or phishing pages, leveraging the PDF as a seemingly innocuous container for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=specialist+outpatient+clinic+meaning PDF link annotation
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/wifovevekewotijux.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/9b1b30a18b4749ceea798adb5c302177/wunofiwolefijimo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f29b6bba67---93994813600.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/56462140075.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/296608301.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607195f62bb89---fupatiwebinafibe.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/59109671604.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/5b302191876e4340b768553be6ad87e7/buzejaninigofavaji.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a5366b074---58908966525.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/dopugobubi.pdfIn PDF document text
    • http://gardatrans.com/content/Files/14468634176.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/62656038685.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/94bd5aebc5bc2b746607fab2b91244b7/foretutedemasunigoge.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/99161306520.pdfIn PDF document text
    • http://wdnederland.nl/file/xunugamured.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/9604e472e7379289a75ed80216cbebbd/34314388057.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ee4e6874---worujudotumupoxoxutoboxow.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/eqnvionvtu962okobk1ielh22f/24460777144.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/dsrg5mincp30r28kv4p7vj9g1b/53301863154.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/79352389816.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7d312b63b760702f8d09f70c8035ba02/pakalesemevigiwuv.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd67a3ea7a---22959680836.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/bfac63abdaa5f7ad5965380f9c2750fc/45618739474.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/kuvonad.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/48rb52prrp22i9f9vaihigk800/gokamemewozoxazutefom.pdfIn PDF document text
    • http://www.andreapondika.cz/file/lebujoxoj.pdfIn PDF document text
    • 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_off0000bf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD747 10792 bytes
SHA-256: 846f509f955feeed3bb36e0e6ca24ab62477cd727fea08fdbb82594d2e00d45a
font_02_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 14188 bytes
SHA-256: 7b3679d44eaeabccceee494159df84eacc54f3c51e55d088f04f01787565cff0

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