Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c6b2c456a8803b…

MALICIOUS

PDF

87.7 KB Created: 2021-09-04 06:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 25f39d69e68022439bc3ba45890e7d82 SHA-1: de4cff929b40146484cc5f343cf1d83b476fa3df SHA-256: 65c6b2c456a8803ba9d8ac5003d922a8de678b3661d720c3142dcd2e2e51cc62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to distribute links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://oniceh.ru/uplcv?utm_term=manualidades+de+navidades+con+goma+eva PDF link annotation
    • http://amandatravel.com/userfiles/file/widuwozeparenetodoxe.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/85149726383.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/tesalugiwujazowepoxitevor.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/52332511811.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8158a9fdf---71801739937.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16086f6f8d4457---80510436404.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2448a03c4588ab00597752779907ea5d/99284083441.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/s2a857un3rna15vvjv6gr4ut92/10782560620.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d8962cdff38---43895077999.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/de9a854e6e07266590d4cc9113eb8856/litubedoxipomibi.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/49653733541.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/89d04b896b970b7e9c54499e1217ffe7/pedimagewawega.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/wenebik.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077184d3b33c---kokikunadaxogubulu.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/26100971369.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/60106623440.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/zademizi.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/21332210019.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a8667a7899---wagaxod.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90f77bfe5f---68973840108.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/30450839212.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/safune.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/hisa3ehg85fn4h8339du2n0l24/pixidavaw.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/suvifonerunawadudetaboret.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_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 18644 bytes
SHA-256: 366bf04944da121105eebab999acda7f30b035c36455ff44600d5c50c86dc789
font_01_sfnt_off00011f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F44 10676 bytes
SHA-256: 9515beeacd3bf63787cbc347869a9a6f9e64ddc54723118487ae34482ba837a1
font_02_sfnt_off0001377a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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