Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e53cf434244bc9…

MALICIOUS

PDF

81.3 KB Created: 2021-08-31 19:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c9f493359c74a9e45f4edc97201f1c94 SHA-1: f461fe8d9d196b992028d116136bc9b7bbc1b9a7 SHA-256: 13e53cf434244bc90cf6a2ed695a9cc92e227f09fbff38503ad549c15b9ee90f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, often associated with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://synerhu.ru/uplcv?utm_term=owl+organic+chemistry+answers PDF link annotation
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087010a9d582---bikudubukazopivox.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/42a656d04851bfc788c9701c4b303bd2/zewelolol.pdfIn PDF document text
    • http://aimic.com/userfiles/file/vedemakakokelosamova.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/48149370029.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/58319406340.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/at3vqu1ko90krcoahe9eb6bgmr/pefegurefen.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/genugib.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8ef71e4866---sekukoripulevupuvupuk.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/ff460efd2a4c53cbb8a94ae5f3acba79/lefodatezikujopenip.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf6ef04d0b---73658691974.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/800cdd66411d115a176e68337648e3fa/75853031493.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/77341698385.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/pomirimoguzekokeluxamuw.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/xitaribafitamaruzavufivid.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/kuteduxizujefafalabo.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/tenulodiromusoresulubub.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/xisodemijorizazatabi.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/bagobigadad.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/b0843a1b32b5252f35ca5ade7b05fd65/13659602603.pdfIn PDF document text
    • http://vetcarefoundation.org/userfiles/file/puxela.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/naxafitalebonanuvama.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f9c4adc80---xerobaxexazafukawusup.pdfIn PDF document text
    • https://funbugs.ie/files/file/94627108858.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_off0000d709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD709 10904 bytes
SHA-256: fb8a65869acde62c1604d80c58b8070210c60189c37caa5366accd9906a2af76
font_01_sfnt_off0000f029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF029 18328 bytes
SHA-256: d8a620a80b6bd0832b9942ecf789a05c39f449ee3c0b9727e76167608b7abee3
font_02_sfnt_off00011f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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