Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff0d0478bc43e036…

MALICIOUS

PDF

73.6 KB Created: 2021-09-04 01:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57602da44c533c8a9dba10c7b2355044 SHA-1: 97ed3d1b84358dcf554b9047f4f780d931644cc0 SHA-256: ff0d0478bc43e0368e39bae365eef8ef084a52761b1750d1ae1513cc0e2d0e75
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://eghamatyab.com/basefile/bainbookcom/files/difakirenidur.pdf In PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/29407899756.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/66c613047d2ff9764041fdcf71451f77/gaxedewolirabafanijofexo.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/89d2dfd7a1ff92d716d6e8cfe0efb877/kelefixepujinonoli.pdfIn PDF document text
    • http://hpmcfamilyreunion1968.com/clients/83891/File/92592688844.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/29184806652.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160862d1bc25d8---82961203076.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b485948675f---90076713825.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/37chi85almd5k7nq4jbm0kg8a5/funagulixopopefemo.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/44cf13fd3660b54cd722716dec645022/58103704008.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/r13od41rmjmgrm72fgohg9qfhb/pugoxadusokuxojebemi.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c514d60008f---98790022035.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160712e06c46d7---93004403337.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa40cb03316---18775527190.pdfIn PDF document text
    • http://iworking.vn/uploads/files/30588564732.pdfIn PDF document text
    • http://edisonprivateschool.com/cote_dor_import/admin/ckfinder/userfiles/files/nunuxesodewedif.pdfIn PDF document text
    • http://garderoba.sk/images/_file/35120123577.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/folikegaguzemugone.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-11/20210511095636164097.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/88796933809.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/rudivinubize.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9bb45a4ef3---66951310511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=competition+success+review+november+2018+pdfPDF 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_off0000ba96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA96 11496 bytes
SHA-256: 931b0824fd73bdcf3ebe721d8592ec0a4742ec7424f1faa5a96ca3059f1e62de
font_01_sfnt_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 16912 bytes
SHA-256: b91c65d92248c776f5bd2cf240825630eba9cd89c6525b86ba33d0754065b0a5
font_02_sfnt_off0001009c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1