Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd29f69470c762d…

MALICIOUS

PDF

86.1 KB Created: 2021-07-03 04:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55d7acc4a868770301ce6118077b6eca SHA-1: 6cf9cdfcc8d138353a61d6193f2ed8dfe46a9175 SHA-256: 5fd29f69470c762dd6d4dc58059e1283a3cd804b172c3cafdfddf90d08d553f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and the 'link farm' heuristics strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160be34d3f326c---xenul.pdf In PDF document text
    • https://wodepcb.cn/uploadfiles/files/vumejegovid.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/77755801209.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d217d7be005---7778117530.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/pujololokazej.pdfIn PDF document text
    • http://esistore.be/userfiles/file/nefigup.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/24632379919.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a86586c2ebf---71882190230.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/b002481b6d4c7cbf4dbc8a73ad728c51/gojidorajigojazerewarokog.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/80561813699.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/ec1fbeeb4c0b82bbfd7192a8282d7f23/pokuvizopegutexevuw.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k3k0t45hebl9k9p2vloaijm6j7/92963757416.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5d228c8c0---78976180282.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/vufukusanadux.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160710cae3db6c---51010446947.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/jamenadirisiwolelageri.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xugujogowodebir.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/06n965puqurge745vh2378ihb0/rezesofejidowusinosewoz.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3jo5vheij8q20cmbuiktquq7d0/21094983294.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ctg4haefl14c3c8099k4dg3skn/52582440368.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/0351c62318a90be856fda3fe3e591b7e/bimefusigidafoxuj.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/jepajulax.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/20521684047.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36183189553.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab314b8cd1---99528913276.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/dufujuwadotal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sample+paper+class+12+2021+cbse+solutionsPDF 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_off0000ed47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 11144 bytes
SHA-256: 7f7d77a0b02990545ddb721278404cc8d86149324416a889780c58f5926286ff
font_01_sfnt_off00010715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10715 16764 bytes
SHA-256: 7c586b4315a54891f5cbbc26ac57068a3b29e3e908321f9c34bf24c38ad3e550
font_02_sfnt_off000132ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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