Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddc252fd2620c01…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 06:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3d97496140b57a07e35fe751a9b6becf SHA-1: 9b6203fa9fbf6c07068adadeee3cca163afd1d26 SHA-256: dddc252fd2620c01dc29e05a73f397688d8f5217c4c892c94fea4ce16fe1bc15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=the+vertical+diet+pdf+free+download PDF link annotation
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161327d9eca7ab---pexerejigugo.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/felibipirexupa.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/78238445148.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/melibakobariwerosarem.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/wapoxe.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/eda8c452c10a9d584cf28f4eb5a07332/67235728878.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/fidajoloziwobit.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37395381544.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/tumesabisolukodovexazar.pdfIn PDF document text
    • https://bdlvn.com/steel/upload/files/25316359588.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614815f286e45---52623080643.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/xojofugizir.pdfIn PDF document text
    • https://camphacement.vn/upload/files/wogopabakazatin.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/kolabedugujoxunabodoj.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/72605684230.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/tumavitaruxilonug.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/nixapevutumada.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/pisupobefewuxagumepes.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/13645574768.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/bejatiritowesadiw.pdfIn PDF document text
    • http://altinay-law.com/images/file/vufixujatijivemizen.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/368c10b5d71ad3e5a69257054a1e1548/98069856212.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/boraxigetixibej.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/62955048970.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_off0000b22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB22F 15708 bytes
SHA-256: ef0b05764426212c4d8f3c385998ddd6da7812f8e5fe2b8c1b1d1b1a561eaef0
font_01_sfnt_off0000da0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0E 10664 bytes
SHA-256: 9445b200618c46270d4904e2ea39fcedb184bec64acafab5fb10273a7d414be9
font_02_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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