Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a6623a5e008ac8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 03:22:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3929bfff794b2267ee2642b42d893121 SHA-1: 6fdfcb880cdb4cf4171b07242494d62512fe0179 SHA-256: d8a6623a5e008ac8299e98d69d5350b273356a93a2fc78e6c3be96b23d57c007
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised CMS uploads. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution attempt, likely using a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=roman+catholic+holy+bible+download+pdf PDF link annotation
    • http://raykingcarroll66.com/clients/2/29/292092747e06e0ab09130fa737b110c0/File/33720868832.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebfb1ce52f---xamujezadi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b09c6100b50bc7e51abcb22997aa342a/93320991582.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/cc32dcff935355c23a10a3f8fba3da1d/70442578688.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/tabozev.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0ad249ddc---38131794888.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/dulavepodu.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ummm58aj57l5bl7519r1j7mgg2/36142248615.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/13203832818.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3d9459cc20fe51da25a5c4af1235dc21/11061744684.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108161258521167.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/basopuko.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6f4387624---58572301018.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec19e2fea7---vuvekonexin.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/82c93c7ad698c54a08003b69ed4349e7/dafetasolufebuxeze.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089750c9b6be---32623369786.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9ea4cbec46652d373b60730720cc2ddf/97710012895.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/fatojebelenidofedoz.pdfIn PDF document text
    • http://djpress.pl/Image/files/22924730265.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/85837509788.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/97501508624.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/wukoxekiw.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/4f7a9d4688234c1e16697b8d0fadeb69/mamalupopulivepupavavafej.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/rupem.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_off0000d045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD045 18252 bytes
SHA-256: 3481ee3d57c25c05ebb25c71586805def5bc24732f330c5a37934f50cadd65fe
font_01_sfnt_off0000ffaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAF 11000 bytes
SHA-256: e3d4a2765e1c6de0f4c5852f7a706bb00c7b747142fa15e250b5d06e36f16ba8
font_02_sfnt_off000118ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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