Malicious PDF — malware analysis report

Static analysis result for SHA-256 6251ffd6ec031ec3…

MALICIOUS

PDF

78.8 KB Created: 2021-09-05 18:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aaad01d023a612914ee764b20bcc13ec SHA-1: 61364be98a85e2109f4c80e9634e0a2f3c86c3c6 SHA-256: 6251ffd6ec031ec32d71662603d08cb56f33f7196e644be2d5803a3e942fde02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=flow+transmitter+data+sheet+pdf PDF link annotation
    • https://retta-bg.com/userfiles/68654617215.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/terusowuluziribewezaxitu.pdfIn PDF document text
    • http://arslanemlak.com/E/file/gitemidulomuvezafusewixi.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afb73db2aa3---89946834286.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q19leq2h6298tolb5jabufhah4/jaluxinilekafewejuma.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/98585382448.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/60045934845.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/vubaj.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/rurozedukitopasa.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/lavanomudozibutefinajured.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160efdfffd69ff---xoguk.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/zimivesezewabojazitemovi.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/33ca45744d8495507a6ad9b714a8ee67/pemasozov.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/xujapiliwiduzalasedevo.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/zegipalopufubufem.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/64608002270.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/didarexajilojiwuxuxefafe.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/70964941533.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/94490284254.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/poruwenavuzoxi.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/zevodalobamimijixot.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/12a4c3f8b23ce1f29b34eae2d8bed89d/95944400536.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/12465541471.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/lidimekepizufufuvibij.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_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 17092 bytes
SHA-256: ebfaa447b22d6351227019e225777b1044c0d7e7240d1da78ddfaa9a84708c50
font_01_sfnt_off0000fccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 10828 bytes
SHA-256: f29c943e2e2138bee6ba51908fc9f4003946ddc19162028fdce7e1fdafe2f2fb
font_02_sfnt_off0001159a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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