Malicious PDF — malware analysis report

Static analysis result for SHA-256 051f05606796583f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 03:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fcce14159f1d0f990218201655053667 SHA-1: 20d16e7e53ec4e9588b9d3f860f95c86c09dfa33 SHA-256: 051f05606796583fe5a4011d7b1bc70ca80e31f69232ef11cfbd5be26ed78a11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=characteristics+of+social+networking+sites+pdf PDF link annotation
    • https://m-astar.com/UserFiles/files/bazajirozoz.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7fc5e3244---36586352128.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/89133176204.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/18010933740.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/71079610832.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7b555479d---44065839021.pdfIn PDF document text
    • http://lse.hu/userfiles/file/10877420285.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/35833089579.pdfIn PDF document text
    • https://digireg.dk/upload/nizonuf.pdfIn PDF document text
    • https://ghnservizi.com/file/17488202645.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/sararexewomapivi.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/9849537721.pdfIn PDF document text
    • http://tcihk.com/userfiles/43394178748.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/wugejot.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161201a10cddf2---lifilarodabat.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/luzexavuwabosado.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/79b120d6896ff99bef6ec55b02b7a515/zutemu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a128e101790---26203667845.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/giripun.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0d3d135b---vumobosotuzuruluwenaw.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fe5a3edc1---gutofimuririrarubolali.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/40334315883.pdfIn PDF document text
    • https://digireg.it/upload/99000347695.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/runuwinewolinumirasigirel.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/26968945567.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_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 16932 bytes
SHA-256: 2ae2f535bbaa080c57fe53cb2f1631cdf3e032309116bd60e138ab604c57c611
font_02_sfnt_off0001219e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219E 11108 bytes
SHA-256: 540f1b6d31272e7c58982d68feea4d832f87255239703c129d5f2599c950c786

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