Malicious PDF — malware analysis report

Static analysis result for SHA-256 e106895264a18388…

MALICIOUS

PDF

72.2 KB Created: 2021-09-08 02:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f64bf922766fd845e955af3ad083947 SHA-1: fe411af3c854100b715e7b2a75640e779ab521cf SHA-256: e106895264a18388e46a688db3517b82677bb7b5df5ab70a9d740a9574b45f84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's intended to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=single+phase+dol+starter+wiring+diagram+pdf PDF link annotation
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a39319681---39425148274.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b256f371a---fugupotimef.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/jiliwejupegebaru.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/8e304ac68d23197cafe0be80bd1289bd/dimanesofojeman.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a18f367211---58846694463.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/6bc95579ffee574b1945e186712725a9/76185980573.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/80967717514.pdfIn PDF document text
    • http://linza-market.ru/upload/files/setus.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eec0ed6acb---tajavamipew.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/9e511a4a699bf5cdfd16bcc772f58f89/bitumurifiwaxi.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/39959759538.pdfIn PDF document text
    • http://jljemc.com/upload/files/tudijigelepofifiw.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210726_3D5E6C6C417F3F16.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/5028532725.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/15491014021.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161361f766a0d2---felewaperemipupajuduz.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/kerowidavemejeritu.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/vesikagulaxomusinofaxub.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/rrfhiq0mfte0qsk419bojrvjp3/wizuwulipavilalevujenovo.pdfIn PDF document text
    • https://marigabung.com/contents//files/98939184555.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/1acf3434ffbf5341b38fa12443680ea4/nonedekisokis.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6da96cb11d9aa047399b786db3a9e738/sununajezeden.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/66885051172.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_off0000b99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99A 11104 bytes
SHA-256: 2a57a4e5abbe25e2bee057b028be73f621bd65e874df45d99f522ce946a39797
font_01_sfnt_off0000d31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31B 15808 bytes
SHA-256: 67dc5a26243671ddadf4ecc5a1fb7d417d23a1a59a4f183ad9257ccf1a5226c0
font_02_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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