Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b17b12bd9d6047…

MALICIOUS

PDF

75.8 KB Created: 2021-06-07 14:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 541363257755accef282a6450477a1c8 SHA-1: c5579db709dd76b078ea14dc8b3b50d1a3808501 SHA-256: 39b17b12bd9d6047a0c118fb16f05b6d7784eee2d3658c15a517dd2e7ed89a09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to sewing machine repair, intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=como+colocar+linha+na+maquina+de+costura+lenoxx+multi+points PDF link annotation
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/tqvlljd12qphu59n86mdqcoi25/57273560381.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/govisowivefonafa.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/tuzapoxedekevu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072047b5119c---dadiginufa.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/40741305162.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901eb3c1f22---29594638280.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90cdc0642c---jawifukapuru.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/nemapoxagogusewokodel.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/vikinanuzej.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc16351870eb6be89666827de22671d7/75568117070.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/sefomodov.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a874bf48655---88222684883.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507055553305919.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210502023540_1081554349.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16097989872a25---kajek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD898 5412 bytes
SHA-256: 357be944fae858540eeeed234e6d5a49b36147f9b1b4521467d8c8a0d022190e
font_01_sfnt_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 12720 bytes
SHA-256: c880500ce1ddffd425ba490e5ac0fadb9811fdb5f4df5e4be116f6ce6988b778
font_02_sfnt_off000111a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333