Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09604eb212cc1cc…

MALICIOUS

PDF

79.4 KB Created: 2021-09-15 16:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11d14e7a46ed29bcca3a283eb0263a7b SHA-1: e84f616a192e86df65148f11ecdeda940fbb008e SHA-256: b09604eb212cc1ccadf48fec69d58c2b31a3805664d789676d123100ea874abd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these compromised sites. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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 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://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161339bb417c51---xoguso.pdf In PDF document text
    • http://roycraft.ca/userfiles/file/61920799769.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613572b996dc3---76179314804.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/fezozunu.pdfIn PDF document text
    • http://tai-group.com/upload/files/77660404945.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/vigiz.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ab5ce8acc---xatuloxuduxaledawavig.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/begewebekijefiruwoni.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/26952668853.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/v4gv0uukfvtlsbt5a5aq550rks/rilexejawonuxegapenonagid.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/50442024755.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/fekafimuginaroxagabo.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/72240737995.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73685938554.pdfIn PDF document text
    • http://teplospectr.ru/images/files/97995127715.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136d6037993e---59792566658.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/90732988142.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138db6907158---lorudekagopaboxuradi.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/53707112222.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18c0436bd---kiluw.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7645b1152---sanogelumu.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/56345072881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=master+noodle+lake+havenPDF 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_off0000d105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD105 10404 bytes
SHA-256: 93571097ccc4d6d5aef4f32b24847ffcaa8319f56cc19fd70ca33c41c2106668
font_01_sfnt_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 18192 bytes
SHA-256: 19db030755bf8c9e152586747ee47affeaf2c4fe81356a1a552790404a291bd3
font_02_sfnt_off000117e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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