Malicious PDF — malware analysis report

Static analysis result for SHA-256 f775137b3e66db15…

MALICIOUS

PDF

80.6 KB Created: 2021-08-30 16:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a260e991bf86f371d5c687a7af8c84f2 SHA-1: e8fe5fbca98fb391b4545d4a73239662dcec870d SHA-256: f775137b3e66db152585f0b2828887710f07d497a69c5e55351c095e4bb90e40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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=db+super+broly+full+movie PDF link annotation
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/n8vfep9boao2i1p9nj0k0l8lo3/mebifozulasojifupiwugu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f8ea48c04---66073815670.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/v5ci4tloeob6o2khvpknn1f7e3/18575696160.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/c82loc5mp9d0q0d7assav4vdom/raduzopoxetikapavibiwidaz.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c316c466fa---pukitedawod.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0095efe298e007d882d553187218a6d4/15906545823.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/91027ece33f94b77334e477a56467899/26264714594.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/55280303004.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/xanimonimovatamizodi.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/64043386947.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/lupivavazuwisuvopose.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b73ff3f465---dafivesesipuxunu.pdfIn PDF document text
    • https://activepymes.com/pub/file/suzifulifozevoworok.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/c991b8b6683b6e255c50044733d13c02/73788891891.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160948214ec49a---68249854037.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/pj48khj22cb6o53ttgdanbf0hp/folibik.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/83672371527.pdfIn PDF document text
    • http://epmachine.ru/d/files/rikewozon.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/97547380173.pdfIn PDF document text
    • http://alkanboya.com/files/file///60137978301.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/9a18d1020313ec21e5a0b05a1fdf5628/zunajijugewepoluv.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d09a32a16b300b67fc27570f8b865a83/gurekikop.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/24884532834.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/8865719635.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/tlb7asjirqt5iu73gbb5jjca9e/82658865148.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/papunovaguluguserowe.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_off0000d0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A5 19224 bytes
SHA-256: 4c174327df89d009eb62ad966a7dcee9eac6325f6a8ee7cdb2e9bd0e31dae074
font_01_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 10576 bytes
SHA-256: ad34f25a3b66cbc17e637b297fdb1cd32f7a09ebacfc8725daa168cdcaef3244

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