Malicious PDF — malware analysis report

Static analysis result for SHA-256 549cea3119eb011e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-01 21:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4453d06ff8fe8d8c3aaed7a8366ce7ae SHA-1: 260898935071166f0b969cb80dbf28d7a81e4e36 SHA-256: 549cea3119eb011ea013d4e4f92f8c814e8ff818989aef9a262908506c78bab8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV detection. It functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains or compromised CMS uploads. The primary purpose appears to be phishing or distributing further malware by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=active+and+passive+voice+exercises+for+beginners PDF link annotation
    • http://reicar.dk/userfiles/file/bidebizafuzusokofirudul.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/37046574451.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/kananevevi.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/38050028919.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/wewoxadogaxi.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/73172195764.pdfIn PDF document text
    • https://stvorki.ru/files/file/viboxazafawedixukikov.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b9c6ace57---46359665188.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/5g861ch5tdidlkekpuedheghh3/97674091114.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d8deca01b---moloviropolinatofok.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/wazuxemobu.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/kemeteregemorabixuju.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/fudenowexomedopipima.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/jipobujowa.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/5r8gu77iebb384o7ip774kraik/85807824823.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b0eabc44e2d---vuxazebelenuzapo.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/xixene.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ufp2nmn9kgue0ba9u1enqel8dl/5078732985.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160de343ce3ba6---54637933890.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/jiviwatiwupirejutetiz.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/itemjrapmek5qtspqst1t8phta/34906707848.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fcfd2559f9b---kuwapilo.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/88363295057.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/vanozuw.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/97690375377.pdfIn PDF document text
    • http://salinasouth.com/clients/11073/File/wafivufakume.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_off0000d440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD440 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 17524 bytes
SHA-256: 98461a8954110b3850819f7440ee79649e2724bc95e1e9aeda365f5bec39e454
font_02_sfnt_off000119fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FE 11036 bytes
SHA-256: 30323c291c48c30295e43b2bd4fc80c318d8b53a38de8d294abfbcd66d70d0f3

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