Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff5e3c5e9921c44…

MALICIOUS

PDF

77.3 KB Created: 2021-10-11 10:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ef6e7b395d82324eff119d4f7ee5c9fe SHA-1: daf9112c7b83b25e3da2982fd034610e7b71a2b1 SHA-256: 7ff5e3c5e9921c448bd16b4678183c50f6ddf8bc6b7b7ac18993defcc08156e2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised or disposable hosting, suggesting an attempt to redirect users to phishing or malware distribution sites. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://anhuizpyy.com/upload_fck/file/2021-9-29/20210929180308357429.pdf In PDF document text
    • https://kristaldicarlo.com/userfiles/file/bafunorisazufoxef.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/nubidor.pdfIn PDF document text
    • https://asiapharma.la/files/files/mutezanurewa.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/25964622709.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/13748595199.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/puxixat.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210920092109.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/luxezezasoju.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/nimezapawamobix.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/24120965388.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/85880630929.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/bexisagezulo.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/40599728152.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118f452b08---girifiliperazesifoje.pdfIn PDF document text
    • http://songchanraccomposite.com/upload/files/40139259055.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/60109259402.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/bapubikara.pdfIn PDF document text
    • http://ndemal.com/publish/page/file/4148610608.pdfIn PDF document text
    • http://casauthienan.com/fckeditor/editor/filemanager/connectors/php/temp/file/sixakarobavu.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/12jpfqmqpt7uqglh0s2lvte904/lizokukotisopedudil.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20211007183216.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b28445e2cd---depokim.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/af8156619793210d3fcad95c28a22b9d/totapimo.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5679ba4a1---wametitesenija.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/22628339044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=speed+calculator+lords+mobilePDF 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_off0000cbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 16556 bytes
SHA-256: 771b86db2c249ecd64b9abef8fdd0244597fc9f6acb7b6bc3fd4d3872bd38a06
font_02_sfnt_off00010e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E81 10884 bytes
SHA-256: c73a8313822f8b807448310f490195611e587a9b213fdde8a37a9c103c5d9583

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