Malicious PDF — malware analysis report

Static analysis result for SHA-256 901ae5e4a783ee52…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 00:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 75f3578c254f322287dfe7595d9fd6a0 SHA-1: 0f0a24a8a2bbcb98958fd25c41f6c16e14080a2c SHA-256: 901ae5e4a783ee529933b8653f923920dd0d52adbb23948ade1cac46c06f92e8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.willmarshelter.com/ckfinder/userfiles/files/satexesoki.pdf In PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160db8b5ab8ef0---boturidurenu.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/jalurawazegizilaf.pdfIn PDF document text
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/90446757480.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611405edc88d9---16644998606.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/69915195096.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/b2ba7ddf0e1b2f9509e0d491b205314b/fojamimepiguligeru.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3f481014bc1022af952f0dab42f2d630/senejodajofuk.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/q95i38sufdhls1a5mm8f3kstv0/17847735920.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90926952936.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/3biqsr850c92nr89k76v6aco41/42250730272.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/voduxilarofafaradimun.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa4d19dcd---60243222579.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/ladoximepumedemubed.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/85352279992.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb9ab549c2---gitujaba.pdfIn PDF document text
    • https://auto826.com/uploads/files/88584517606.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b6911b827---60096530231.pdfIn PDF document text
    • http://cissi.it/userfiles/files/5435940338.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/oe9ducp43cd7svtmnp21uuss07/gezaxotiwozobutewozeku.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d950b406a---22117882876.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/54924822319.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a03be63db9---28969201182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=civilisation+progressive+du+francais+niveau+debutant+pdfPDF 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_off0000cc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC74 11132 bytes
SHA-256: 630b39698c8881f2ae1b0c164b65f113a351d4930a9ee717871f7fe5ea756c91
font_01_sfnt_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 18616 bytes
SHA-256: c17074bcdc757118c1db56022fcb6a4f9f6fcfdf55d535e34d10ece05d3cfe3e

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