Malicious PDF — malware analysis report

Static analysis result for SHA-256 192fc5db3a4486af…

MALICIOUS

PDF

74.4 KB Created: 2021-09-01 08:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 859a1832eb91c058ee2f05fb584b2d9b SHA-1: e6eabcf044d4fa96826c62732c088fb5ddbcbd73 SHA-256: 192fc5db3a4486af817532fb3c4b7ad52b769ecfa3f3f3533106b311c859c9cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=pdf+payload+for+android PDF link annotation
    • https://gkia.org/kingkong/userfiles/files/nijikafoki.pdfIn PDF document text
    • http://norview63.com/clients/5/59/59ba6e1aa7224642a1eeb14435756cbf/File/2799729866.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/tewabewalubefowixokamuda.pdfIn PDF document text
    • https://migger.dk/userimages/file/rerojemik.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc64ad23589---36423100140.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/dikibuxidiwuxenof.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/66740964328.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/00b486d56baf53d0406b89f3b7315302/661123144.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/81131765795.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32434d8c4a---8262282084.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/turedutis.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bc808884e---niwepifojozisesoses.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944dc2d18e1---73452613906.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/7d2a9426f0dc203dd7c37cd6e821817d/47454368359.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba09b7a73da---xaradibid.pdfIn PDF document text
    • http://ore-processing.ru/d/files/lefeditiviv.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/xigokoganulake.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/bivinorogikijukotuj.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/suvesigawipoza.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/lufetaw.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72566063380.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/nurenidoxibiwirevujoziji.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/zidenibefujupoxem.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf88cddaf26---tomaratasuduxa.pdfIn PDF document text
    • http://primaneighbors.com/userimages/gedabefitu.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_off0000c037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC037 16588 bytes
SHA-256: 97022bf2aecea6b60752ba241b9ff97f9efc423a32a47f2ecbcf12bb265ae838
font_01_sfnt_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B7 10208 bytes
SHA-256: 2b0898b8e4d1315ad005c10c8fcd27697ed213e2fd75d3763497738e8d08018d

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