Malicious PDF — malware analysis report

Static analysis result for SHA-256 95bb0193d026b8b2…

MALICIOUS

PDF

75.8 KB Created: 2021-08-14 14:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 89424d6a5fd83ebf899ca4b21436997c SHA-1: 32375745244e1e52e3aadbd90330cdff4526e71b SHA-256: 95bb0193d026b8b2cbb761570cc39ccded2eb6627b2c6995d4153366f7d3d0d6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to phishing pages or download further malware. The presence of external URIs and compromised CMS upload links indicates a multi-stage attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=the+purge+election+year+full+movie+download+hdpopcorns PDF link annotation
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edb70ac96d7---88876296399.pdfIn PDF document text
    • http://schokozentrale.de/idata/34850695537.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6f5491e3a---83656319312.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/0p2bl541l4jbp5p9eieccdospo/7198544669.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/38398688764.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/fb95a8e8d8908629eaa0bc9774677a8f/29087483500.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa89d691254---duzenefirudunorilo.pdfIn PDF document text
    • http://industrialdevices.in/uploads/kobizasukoxapuzovubejareb.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/98296514301.pdfIn PDF document text
    • http://redactron.com/userfiles/file/43629250823.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/82374240232.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/dbcrbntst4ka7srs7m86u5pt00/sekaxaviberigojoge.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9271a8136e---palitu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f766c93d7f---31227976680.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16074213891404---tikejujerul.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/feb572504958853b6f425b4ba553ba38/34444633877.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/66780245903.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/36216706270.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b2576139---17985797438.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/j6be4hjvrc773ttd1l88febkb4/juronozijeluxapaxug.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/93a0de53c7d0518011c2d359ee75fa3c/lipukuvaralogowul.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9698a79b4---dadodukisuvobefifapom.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210814132119.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/72705803927.pdfIn PDF document text
    • http://ridendo.cz/files/file/54171585386.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_off0000c74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74F 15208 bytes
SHA-256: f73db45f7ae27e5efce307d72ea28cbb21dd0a0a815aa2e140f355c3037e3699
font_01_sfnt_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 11396 bytes
SHA-256: e4dcbcfadf996352875fdfc0078cf351fb9d1f1d8dd266524c922d35432d7e43
font_02_sfnt_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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