Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae0ced3cd3f03acf…

MALICIOUS

PDF

91.1 KB Created: 2021-09-07 19:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d76b347422d27b5a4c9494e1b1280f4 SHA-1: 7ffc395d73d1083f8cd90ef6526992c5871c8a2f SHA-256: ae0ced3cd3f03acf4609832780065ee2ab32c1b67f432cdfcb637369fdef8467
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised websites and potentially malicious PDF files, likely to facilitate phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://leaguengn.com/userfiles/file///17914053809.pdf In PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/xokepanajijoxaziwevi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d9da5b402---weguvagapafetidububupe.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/bdcedd17e790011e0958623f51a7f7f7/pominu.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/nokatizarorovadetagupada.pdfIn PDF document text
    • https://schmitz.cz/res/file/53567750083.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sodenadopisipukafitureve.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210523135023_250894562.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/sabolesujinad.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/79188365168.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e80d0292b2---81147922452.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0a2b0f7e987b5adb88cf20e52c5d8eae/53441041244.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/38457177791.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/43775164121.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feab2084fa---74640808176.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/lifuxododazowit.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/damedup.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/matakaxuxa.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16095e2e7baa30---68263190279.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/kaxivujumukemirek.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/18122551081.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/sakamavimet.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c5d06f94b55bf24cb858e28ba73bb495/66235045142.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a920b679a1b.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ultrasite+user+manualPDF 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_off0001033b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 10256 bytes
SHA-256: 6aed8d995f8272a3ed0e08a932d73dd4c0bcdbf154074fdf3da18b0491ecdcfc
font_01_sfnt_off00011a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001324e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324E 17120 bytes
SHA-256: aba6bae5024534a558123e22699971eb064c5133ef974163fc595a50d31c9366

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