Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9abfd19a7b4c0ed…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 04:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8e4655cce634856ed957e96c5fb61f4 SHA-1: b4796dd43d5169f7da7b29a7fd824c3d02ba9972 SHA-256: a9abfd19a7b4c0ede1331907fb2808e1d632b430bd6a3426a1ab7c79e47e1ecb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the structure and URL findings point to a malicious document intended to lure users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaadb4d5d3---bozip.pdf In PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3ceabf18dfda241b72907b8f445916b0/35669370091.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd5725f55e---govisunukiluzebo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161323a6b949b2---kanixagovu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/82509bfe63392ede815c861c7f8fd063/91252867437.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/77561515490.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/10991541628.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/37378340452.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/jasapek.pdfIn PDF document text
    • https://shopabrang.com/images/files/75907292632.pdfIn PDF document text
    • https://dhesient.com/media/46275747690.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffdb8a2358---22203933195.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/55962506713.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0918446001624221156.pdfIn PDF document text
    • http://it-hair.com/userfiles/reliropolekanufemukin.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161288f773c3f7---16123623190.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/o5j1goidshk4ov5q026gsk00o0/40401763720.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/renelavo.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/sorokebamedoji.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/55e9e09bb77a8e69057630413a523175/tabejafawizo.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b834a309fba---51841747900.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/69437755333.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/98457704689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=immunization+schedule+chart+download+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_off0000d478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD478 11080 bytes
SHA-256: 5e72ab2ae5bf12a905260aa17ef9a7d9dce9952bc2d308c33e79b741d5e70478
font_01_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 16516 bytes
SHA-256: 691f712825b0e5310acb9bfaccb5ec2eaf3f2787977ec70f3a2abcc0f33c950a
font_02_sfnt_off000118c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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