Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a52c5f7c3a6bca1…

MALICIOUS

PDF

87.9 KB Created: 2021-07-16 09:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7518cee5a19f126b4fbc79475cd18f11 SHA-1: 16d382dae8a7f5bd4d074affdb1721a2bc636c61 SHA-256: 9a52c5f7c3a6bca169e3175e4f0da85e0dd8e5bd4ed900e8fe92d9c928596cf7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the presence of external URIs and link farms is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://drafthe.ru/uplcv?utm_term=15+days+practice+for+ielts+reading+pdf+free+download PDF link annotation
    • https://waroproject.com/file/gefowamujarobigex.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cf7dd91cf---74674410364.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b045b3e9ea8---zeligobutorapudupulivaf.pdfIn PDF document text
    • http://nessium.net/userfiles/file/xuvufegitil.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/fedidabokerubovofopotole.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/bbca3ec1c7963b72f662611f733b4ae1/levekudimopibawavojakuluj.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210516/2105160429439293809zdcd0f15lzg.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/jirezufoka.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6f1adfe40---jaxenafenuwikuwuzuvaki.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/79336651149.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/0egv6485vapc2mis504ees9loe/46034894184.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/45099665676.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/d14292ca99c468caadc5cbff1abc7a68/belasimokugegojiriluzajo.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/50319972226.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/32730401366.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23451b5cd6---87701299782.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/e46oer532g6de06et74urbauc0/rujofupapa.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1df080f79d---xapapipifev.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/36283801445.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/au55hg0oov4lk82nggsblba4q0/31508928632.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/44640982670.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/xizezepoxoreb.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4e6a17aebb4f11e4e8f5f1ec8d9130d1/42286263939.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/7be7ad412a3a746d343c47dbcf26119f/27021070132.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/xufaxeludavetevosopenaza.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/sarezorojadadi.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_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 16912 bytes
SHA-256: 47d408c38334cfb28d778544b968fbe0cd974716394e5c0697e9616d882931a1
font_01_sfnt_off00011fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C7 11084 bytes
SHA-256: c3fa4907124ca3fb735f37de0d3c1b374f672713f95e9dbfdc3cf65af6885ac1

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