Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb06affb3e9d76ed…

MALICIOUS

PDF

95.0 KB Created: 2021-09-18 14:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 23457655453d3b12ae1502621cf0ea74 SHA-1: 89eebe34e6c66d5ad43e9a882ba624fad8e313f2 SHA-256: cb06affb3e9d76edcaf2d18d4c3e1402ddb6dd6c0d0aebae10917c60ba1e1da9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, with many links pointing to compromised WordPress sites or disposable hosting. The embedded JavaScript stream and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=applicazioni+per+scaricare+musica+gratis+da+android PDF link annotation
    • http://tianfonmm.com/d/files/89337100672.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/7047016804.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/94001373289.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/57021840592.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/daxixupasosovujewixido.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/41276306066.pdfIn PDF document text
    • https://thehouseproduction.net/file/86663236662.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/nixejidarisogi.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/pijipafewera.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16142c1be95cde---terepomadojufi.pdfIn PDF document text
    • http://kalikraft.com/images/file/57222509098.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/paboxopijazuwazizib.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/13862636612.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/67411110329.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140be4cc8d43---zupuzalabutisijafadeduxe.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/45389181230.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/g2shg92ps8ujlutrns588oeus3/48701047696.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/sevikiwisopagoborigika.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/38252112916.pdfIn PDF document text
    • http://elpijisystem.com/file/debalika.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_off00010cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 10996 bytes
SHA-256: a621b9eeb0e4f01c3a5eca8c8fb8182adc2da45f4fce13620942c8fb002ac19b
font_02_sfnt_off00013e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E77 18036 bytes
SHA-256: 99d1a65180560801286f47617105dde70bcaf1bbd15f82a9bfc1b1cb03938a08