Malicious PDF — malware analysis report

Static analysis result for SHA-256 25f6d29b09f5af47…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 22:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ef9381612c12549f1dbf99ba6679321a SHA-1: e310f5c6866a5cf329307034bc3e83f4b3a9421f SHA-256: 25f6d29b09f5af47c9a8d84c9f6b16b7697665de19c309cc665e0277f7dda9e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://krisoc.ru/uplcv?utm_term=weather+lock+screen+android PDF link annotation
    • https://almuhja.net/ckfinder/userfiles/files/zepenu.pdfIn PDF document text
    • https://www.nbc.com.vn/ckfinder/userfiles/files/kobuxogemila.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/3685022224.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/80721002036.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/pujagazorumoridobetuf.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/zumelinodil.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161405ea57bbbb---17019176688.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///5713963704.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/larudozo.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/wasozeragavaragodubuzuku.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134146acb366---gosapozekuvu.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/memewuramisimukabedukuwaz.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd47c9dd12---sujomum.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/59435063842.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/pozawagut.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/sajubuko.pdfIn PDF document text
    • http://deforma.it/userfiles/files/20102006534.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/wabitarujem.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/tewipuki.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/54853699500.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/mewiwowogoduwiza.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/1849904668.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/73131734633.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/10078650520.pdfIn PDF document text
    • http://whygzy.com/Media/Uploads/files/87072776920.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/lujowuwaxuwu.pdfIn PDF document text
    • 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_off0000d3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AE 17956 bytes
SHA-256: 6b7afe00f1653d75011f1fe23bb837296f8aa51097e28fd03b542bc6f82c21fd
font_01_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 10552 bytes
SHA-256: 8c0fcb11615bc9cc200d47dbb7a6532a8fce129a46910cb3be277b80c0801074
font_02_sfnt_off00011a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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