Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd518eb370a2152…

MALICIOUS

PDF

128.3 KB Created: 2021-06-10 07:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 34b6c98132163a5797eb741b16cc5f3d SHA-1: b7937d42943fa81481fdf75142743bda67f53632 SHA-256: bcd518eb370a21521ece86a4db49eed59b4be2a94f67c4f01da3e9e5ccfd810d
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://catamma.ru/uplcv?utm_term=naruto+shippuden+ultimate+ninja+storm+4+download+%2526+ppsspp PDF link annotation
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/f4b9e92f3bf555723563956a8de8d987/resisazesawilotepidudalux.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac806dba0a0---24392212265.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe33dbf96e---20673417720.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080256829dc0---fatasesoj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a064b08d3f7---78791047358.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/95e2d1883fbb3922c008376eefdf0120/52203536246.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc40976ad---6767351215.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8aac55bff487a8a67e0d3c40fbea6630/rozikowomuw.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/renel.pdfIn PDF document text
    • http://lhsclassof68.com/clients/73441/File/50864753753.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609550c5b4382---sabimafuxibifebaz.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/79328950099.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/rrmbd655kb2o84r16t29788n4d/winadibewuwukezojafosu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/cfsd2op1ncomkgvf03s922mou1/76403787158.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5a2189835---43007313734.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/akc13721hnrd4ni2tbauc04106/8998857305.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9cb715196---pogujeta.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/47922263110.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13184 31796 bytes
SHA-256: 55b2cb70b07f79fc511fcd95ed61ca43ddcae756d8af964baddd6e775aaa5c4d
font_01_sfnt_off0001953c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1953C 5308 bytes
SHA-256: d4c83a05e302bed8f0fa962de1876165ba73d17c17ab1ece51912d12ca052d7d
font_02_sfnt_off0001a72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A72F 12332 bytes
SHA-256: 458e7bddc4523110803cfb3507c4b95f469a35301b1547db8740c645b92fb207
font_03_sfnt_off0001cf03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF03 16280 bytes
SHA-256: 90f804cd782231c815291293ba782eecf5b59fe4e5a655d4fd2814b0eea5e6ef
font_04_sfnt_off0001e497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E497 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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