Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1acce2504ea6521…

MALICIOUS

PDF

77.4 KB Created: 2021-08-30 08:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d10ed41e9299d82c086bc08deb4c683f SHA-1: 0d8220f2411dd75b75564da5c916adacbc1ee89c SHA-256: f1acce2504ea6521d197d2f0ee51d85573b1f7e140a5656734b31a2264c45810
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external URIs and link farms pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution campaign. The document body was unreadable, but the presence of many links indicates an attempt to redirect the user to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://philabc.ru/uplcv?utm_term=remarks+of+flat+iron PDF link annotation
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/jmfvpp543nmg9opo7rg5s5u1kd/79898793234.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/tusawo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fd57af357fe0fac4482563cfcc51aac1/zazekejurabukavosiz.pdfIn PDF document text
    • http://alptw.com/images/files/depekososexisemejo.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/70633738940.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/suxofugajotuxumunolinopev.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08f5e7dd9d---419507975.pdfIn PDF document text
    • http://ahchala.com/img/file/12947497150.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/16fmfd4cm6jvd0hcnh992roh5h/sezem.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/856b0f963abf34ff128bf4bc1a191110/namatulib.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90f9dc030e---59638043387.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607195e15266d---8024256113.pdfIn PDF document text
    • http://islandpointfl.com/userimages/35919702734.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a01a3adb4b2---jexotupem.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/300551860.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/324dfdc51c07e7488763839fc66b00f4/vuxudabebofetufibetepu.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/ca341003ca2ae173bdf20c696e9ae67f/75173459726.pdfIn PDF document text
    • http://cuiquji.net/d/files/30691565984.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/puqbms8etfdtfehiqvbedvuvvu/95542610146.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/42037853737.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/26600819583.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_off0000c9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FB 10512 bytes
SHA-256: 98afa91bbdba933548671464a091d0e13eb12dfaae146fc9dae04c7d18c5088a
font_01_sfnt_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 17556 bytes
SHA-256: 9b608464be8d9c35c0bd128fd22674432f42723885c369e41fcbeb4b79a0a8a2

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