Malicious PDF — malware analysis report

Static analysis result for SHA-256 87def4e725f9b6c6…

MALICIOUS

PDF

84.4 KB Created: 2021-08-31 02:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c81137d0276cf480da7c0d25878eceb SHA-1: 942f297cfc385bb9d0ca997ae33b2c40b88afbde SHA-256: 87def4e725f9b6c6dd4db41a5f7817b218be73945e04276d076d14b8f80415bd
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://becucci.it/userfiles/files/pisarojuleze.pdf In PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfa578b416---totox.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/77600508195.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/4d4b1b496f0291cbaa8a980e5a94984d/89129880934.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/fowipuzibajevonadexa.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/fozuxiwulasapabimonim.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/697863408e7a810aae1cf87cf3c4340e/sebizatidolonusasonitabon.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/0k9uvrib81s970d34nv8fa3jhq/bimutagamudiverorizib.pdfIn PDF document text
    • http://henca.com/files/details/file/68975425027.pdfIn PDF document text
    • http://southwest62.com/clients/6/66/666176aa584decdbf8d0f1e9213c5ee1/File/kenejif.pdfIn PDF document text
    • http://108homed.com/userfiles/files/vajasulijunedow.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/17909869731.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/12455178041.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608703d52d127---lununubimodojogad.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f01facdbae4---tewugagatuviwepikesi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3b60d455da---78306445075.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/37148734364.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/33182945375.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/dalas.pdfIn PDF document text
    • http://asustainable.com/global/file/48791298862.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc428d64b2---fivivamazamejaveza.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b44574f301---80608969594.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0935ddfcf---96913123386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=meaning+of+indentionPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26c8dada91---7794041610.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_off0000dda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA2 10208 bytes
SHA-256: 2159cf532e8f786d54657ba697cedae87773a332b1a16ace2f0f0d8949a8f3c8
font_01_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 20464 bytes
SHA-256: fb1fbfa3e57fa15ff9fe5724d073f73aca32b4d3b89b1e8fa77eb5f7ac8f0d21
font_02_sfnt_off00012996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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