Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68700a15f9ad9b5…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 10:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: ac9028bcc96420c3257fe662e99dfdf6 SHA-1: d1726ed0a0da21f8dc238cb629c364b344245af0 SHA-256: a68700a15f9ad9b5e76947376581fe299cf66ff8930c4be8ef63b7fca20b3f62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9987

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://drafthe.ru/uplcv?utm_term=meaning+of+idiom+a+stitch+in+time+saves+nine PDF link annotation
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/s87oj052a631alttps6fu934h5/40604293177.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/3091418843.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/14180999661.pdfIn PDF document text
    • http://esistore.be/userfiles/file/makudumanasoxati.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/seginiresobe.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/79623027508.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/witenigopimerugosapofu.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3736ac77b---41867923425.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c37aebc5a---wisanusid.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/c0365e36421f1981acb4cbfc41ccf77c/81307324926.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/ramuw.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f8071503bf1791e7a7fe4ec676c3e11f/77431260888.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/43425269374.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/29478025519.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/8835678377.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4492fd0be05b80763287b632ecb521df/gonujosus.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/47566453142.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e8b1d436b---97665634720.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/16921090378.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/kebaxaniwot.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/binegaramofata.pdfIn PDF document text
    • https://samowar.me/upload/file/72171269866.pdfIn PDF document text
    • http://chromavials.com/d/files/44179189588.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_off0000c70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70B 10836 bytes
SHA-256: e6103e898545f076e57f3dbde6e5d36fcd26bf1c892255f24380879728f712da
font_01_sfnt_off0000dfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB3 17288 bytes
SHA-256: b37329ad1f6a46d0cdc8a5dec6fbf09899dd103408ba8ea35430bbc3525976aa
font_02_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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