Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8909343919e258…

MALICIOUS

PDF

70.8 KB Created: 2021-09-16 00:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9815d8c41b2320981492c492e956a6aa SHA-1: a3033d643a34d9b7753bbf45d791ae999dbcb223 SHA-256: 8a8909343919e258764686645c14e63675d82d0559dd70c431ce108af5727b76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wecans.net/_UploadFile/Images/file/letotazeratazazefasoz.pdf In PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/51686131866.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/66107181019.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/73384584483.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/podujole.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/95615389517.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/taxaviwigezanulerofevaf.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/36645601178.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/61326086866.pdfIn PDF document text
    • https://oferta.lt/i/File/18309301700.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/godusu.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/livuvivuxororibi.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/zuxufog.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c7af37ed4512159a650541ce81aa6185/53188898990.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/perimidivemotef.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/26516652109.pdfIn PDF document text
    • http://hoachattn.com/image/files/8816205472.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1614057f4e07b7---biganasifekali.pdfIn PDF document text
    • https://goacetours.com/ckfinder/userfiles/files/kitemiba.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f02f12f0---dajube.pdfIn PDF document text
    • https://polytex.de/sites/default/files/16095912340.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/96968384589.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210901215556.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/xexuvetexetazidupava.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=amex+cc+generatorPDF 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_off0000b687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB687 14924 bytes
SHA-256: cfdfe00179f431400e90e45ca4a2982529735580590933a3a854b85bdf89590c
font_01_sfnt_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 10348 bytes
SHA-256: 735a057abef4ceda659c2598c096db53b2788fb3bfff5e37c3141e8570623a87