Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a1d7fa16de3285…

MALICIOUS

PDF

80.2 KB Created: 2021-07-22 04:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 56eb8d55dbb9ff500b12a4ca358d0949 SHA-1: 0bdc8fd5cb3b85460fec172203a2a2dc125ce3a2 SHA-256: 21a1d7fa16de3285a51006e785b2a55265f8481992548e7b3a0a8fdbe1ae7e0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and a high ML score indicate a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://garmagostaran.com/Upload/file/wewixuxemiketumumonu.pdf In PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a0f0292957cfc47e38f2d5ec890fadde/19447503204.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/073f1adb0512f3571e98c169318d2d74/41850395768.pdfIn PDF document text
    • http://2440027.ru/upload/file/dodebijibud.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098d38747f29---37080529190.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/01776s7523hlrc54eco8ih4nlm/19076256738.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/97293327109.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df7d515c13---21327006096.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/97qc8dgu8ucsbgbeucllmvadcm/rafanaxogej.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86a9085a5---51235490426.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c080dc00e2e---291399682.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/79960972400.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/27203262655.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/luteratej.pdfIn PDF document text
    • https://lesura.net/userfiles/file/joburusek.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c8e86c3cd6a0ec92bccc496b83fb5b03/veniwuwubazalawararoku.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/39735462488.pdfIn PDF document text
    • http://fittbike.hu/files/file/97940382794.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa590be7a4c---49525526388.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/3064454678.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/mejakojo.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/jqlqvdmq6e98bh2kggh3jqibrq/41612917248.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/e325cs1e4sumbaok2am6686uvd/doxaxokev.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3bf1ec1f---rerepigolupis.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eacdd67012---22669090720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=view+pdf+in+html+pagePDF link annotation
    • 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_off0000d47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47B 17836 bytes
SHA-256: d44c0c0f94f50c757f20c1d81e1dec915618558ce0808f1bd102b3a167d8a6ed
font_01_sfnt_off0001038f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA6 10612 bytes
SHA-256: 0aad7370011e2a2e444d5f3ea9b097643805b9c2f9f046f2975996dd6e985b8c

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