Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0cbfb0d8ad62c9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 01:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9d5d19c3a4a26936c3a48358c3654a28 SHA-1: 9dadf141b94a3cb40c3fad796cb9bae4ca0a5a8d SHA-256: 9d0cbfb0d8ad62c928443b497964c07d7aa5295e61d740b60b225011516adddd
164 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to potentially compromised CMS upload storage or disposable hosting, suggesting a link farm designed to trick users into downloading files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://madspot.dk/ckfinder/userfiles/files/13082328699.pdf In PDF document text
    • http://acpiindia.com/userfiles/file/guvufalaweteripari.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/pobinobudi.pdfIn PDF document text
    • https://medtek.vn/storage/file/mamomabof.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/rodunewixefezaxowogag.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/8998390727.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/41176491976.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/xagezid.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/37776580401.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/26435948709.pdfIn PDF document text
    • https://km2804.com/ckupload/files/17943613176.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/89622461111.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad746ce47c---60676137015.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0daea72d000499fcc2b8cce8dec9b02d/varefaleme.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/jefojosipiruduxef.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/48475062546.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/342e175fa774c3604f5c54d8914ac11c/26232484601.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/babiragupinilofo.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/wegumem.pdfIn PDF document text
    • https://angkagenap.com/contents/files/ditujuzosuketifodojazok.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/ropodukumajaguzunologaxug.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/miluv.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/xasofirewupominelurese.pdfIn PDF document text
    • https://pepsima.biz/files/file/xokuxim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=vidmate+app+download+install+new+version+2019+apk+free+downloadPDF 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_off0000d78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 18280 bytes
SHA-256: 1412f603b1b23b316a9eca6cd6bd5ed4f2cda268b080ec58b1b1fd6b2d7ce845
font_01_sfnt_off00010785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9C 11332 bytes
SHA-256: cb1171c764da4b1bb9faedc1239e3ad092b87a2577e6e9b08c134473e8b2026e