Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7b9e6d1487d311…

MALICIOUS

PDF

78.6 KB Created: 2021-09-21 16:30:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca93586ada119834149fd0f264510682 SHA-1: 27acbcbf127c96b7026ed98043d761aa55708872 SHA-256: 8c7b9e6d1487d3113c3d6a86ea1bc6bf014cf740f5a825d4c2e76877c96c1b22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://swagath.co/new/ckfinder/userfiles/files/jofumegudorif.pdf In PDF document text
    • http://www.sauminandy.com/fckimages/file/futifeva.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zefenuwujefovuwubemig.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/brjq4bpmdurf628l01o7qvtflc/80354759898.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210912080351_2eegjs.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308f3ed2693---33961649282.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/tewuzenepoboxez.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/talulikawesozigogagoji.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/22451698675.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/napitenuzuvexafodafo.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/74926649575.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/23491534704.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a48e6c63ca---95548524231.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/97524599401.pdfIn PDF document text
    • http://cistenivytahu.cz/upload/file/1361284572.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/15955993105.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/2477976595.pdfIn PDF document text
    • http://sro52.ru/uploads/files/62763239511.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/50874059419.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/lubenowezavikogobana.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/44623325749.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/67118536851.pdfIn PDF document text
    • http://www.bash.cl/media/file/miwabegepujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+know+my+phone+ip+addressPDF 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_off0000cdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 10896 bytes
SHA-256: ff7aad556cc57753337bfe0d941859b045529605bdce26d92936802910763ea4
font_01_sfnt_off0000e6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D1 17604 bytes
SHA-256: 0d6b53781ebdf73c70ebf2dde6233efcae2cae195d4228ec95a53d1420124cba
font_02_sfnt_off000114e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1