Malicious PDF — malware analysis report

Static analysis result for SHA-256 649780bb261c83e7…

MALICIOUS

PDF

79.0 KB Created: 2021-10-10 00:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9eab8e7216cc9b63eb9bf4e6212592c6 SHA-1: 40abc5f672a123625baf67898526ea8f351651cb SHA-256: 649780bb261c83e7140dfacfba02fc231853fcdff13502e23fe52fe492f1cc3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to potentially compromised CMS upload storage and disposable hosting. The presence of embedded URLs and the overall structure suggest an attempt to trick users into downloading further malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://hanoihome.net/img_duhoc/files/kemiwovelovitubumali.pdf In PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/motekuvajixugufib.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/wunulepozenenajubuvuraz.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/dumebiwoxopogimu.pdfIn PDF document text
    • http://inruho.ru/ckfinder/userfiles/files/47350766893.pdfIn PDF document text
    • https://basisangka.com/contents/files/zetezasikagimoxojidelo.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/61359946370.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/99906236720.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/modanajotop.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/jegonizezirigexobelamewo.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210906092112.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/93547035570.pdfIn PDF document text
    • http://kietminhrivet.com/upload/files/74395312418.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/66590426865.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d32847313---15830544166.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/1243317151.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/mozuzifijepugaliwixoxem.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe27b994d---raxoguliduvutibalamosewaw.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16160c1bfbc877---11215640928.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613602c9947f3---wilag.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/niwijujenij.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/mudowibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=section+wise+current+affairsPDF 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://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_off0000d29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29F 18372 bytes
SHA-256: 735a35266f4762048d6a55809d376b3ebaf7fae51b850c6847b890d03e6cdee0
font_01_sfnt_off0001024d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A64 10544 bytes
SHA-256: b38ec95b1c3e786e006aab004807b5f146b824f80ac5ab349d4d92eb7026d37f

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