Malicious PDF — malware analysis report

Static analysis result for SHA-256 150406aa6a4fe567…

MALICIOUS

PDF

81.2 KB Created: 2021-08-20 14:49:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: bdeb6b22c1a0c5863e808524c19e4502 SHA-1: 37b983c9368e55880f8a445d3692039b9057af18 SHA-256: 150406aa6a4fe567afccd0b70a55cd33d9c0f7c763ab357dd4d94d3072b9b98c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or exploit kits. The presence of a link farm on disposable hosting further supports a phishing or malicious redirection intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://kondicionery-vidnoe.ru/upload_picture/file/33126921895.pdf In PDF document text
    • https://lecourbe.dk/userfiles/file/1259552169.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/54141136535.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/78291198698.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160945cb1694ce---16533490816.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d8415aa81b---nimesove.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a90d12f29fbf2ae0c7e5359158f0510f/55930415283.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/31860281143.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/zisomol.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608317545cc3a---88968470577.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/xapetotosoto.pdfIn PDF document text
    • http://benly-carson.com/product/files/tawegotokawedirobug.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8b57b5f0bd9aa6dfb81d0ff477f7ac28/tulasizenuradin.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7piu0eebr5c55l10as53rj0ecd/puzesozerizo.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/f0caqg7pjfd7ci9stdfbo24vo7/dapexamalokuwojizajot.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4157852e0---71324404990.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161103a4ebb2d2---2628927045.pdfIn PDF document text
    • http://goref.ru/files/file/movasu.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/69030170357fccab8b26aadc07cae20e/tiwasavugivixesomonigikub.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee21e83af91---tejib.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16112593b2e94f---22680186811.pdfIn PDF document text
    • http://intergeored.com/upload/File/repoweguwekirin.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b6e9fe15e48b477fb1067410bfd66af9/panevaweguwufiwizaw.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/19892318188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=6+piece+wooden+soccer+ball+puzzle+solutionPDF 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_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 15880 bytes
SHA-256: 2b252cada79bd9346340b09596c50d4dada74d6bee5e8918eaeaec351c83e34b
font_01_sfnt_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C66 10964 bytes
SHA-256: 7a9840ff7d20d27fbae4147d1ea86568d6cc937e58a9539b0c6b4e3c02305e6a

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