Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6bb2128c0a2e493…

MALICIOUS

PDF

75.2 KB Created: 2021-09-03 05:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c1325c1aee554b0c19dc9c3b2bf3438e SHA-1: 9c19b772597e9c783408c747f44ec4f0abed4072 SHA-256: b6bb2128c0a2e493596d26d8379b35dd2971f2888ae89ff04976f2d7e697c819
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://queure.ru/uplcv?utm_term=motivational+speech+for+students+in+tamil+pdf PDF link annotation
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/11def1172106804728ae252767101b7a/72968900029.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/99405768239.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a1292f45d---92432650197.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebc5887b35---63806668117.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/vigemikezilidejedigi.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/44985332674.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124f775208cb---19450172865.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd58f5b3fcc---ripib.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93837344520.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0d93c9667bbd99f4d9aebce4eac4e024/56407380026.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/cf5a2b87220f1ab8fb9cf8ec1274b1b0/tasereb.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2c86d1eeb---gotewaledigijobeb.pdfIn PDF document text
    • https://digireg.nu/upload/lefodawisakinanefonivolug.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c31eae133---temud.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/61381859223.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///57352205448.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/57010442036.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/85954153746.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/82700102126.pdfIn PDF document text
    • https://signika.pl/Upload/file/98686489493.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/36374709020.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/tisiwejifazokogojujojiwe.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/44723735431.pdfIn PDF document text
    • http://planbmedia.hu/files/bibatuvapez.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_off0000b975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB975 20588 bytes
SHA-256: e73f441872be50c1ec1a65868d44e57e06dc288dcdb766e077a4b64e009e9de9
font_01_sfnt_off0000ed61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 11044 bytes
SHA-256: 50b47c09cecfa81f9a21478ac01fb8462b9ed81b8cbb921dec93316d54d409eb
font_02_sfnt_off000106f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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