Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51566377eb2a3fb…

MALICIOUS

PDF

155.8 KB Created: 2021-06-25 21:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4554d22af9adc697c21e022ba892a71c SHA-1: f85a5057e8520b0a72f6c363abfa895219788be3 SHA-256: c51566377eb2a3fbc629bd2fd3d2e878712cd0e5b62a94b67c5041cfad800d74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The heuristics indicate that the PDF acts as a link farm, pointing to numerous URLs hosted on compromised WordPress sites and disposable domains, likely to obscure the final malicious destination. ClamAV and the ML classifier strongly indicate maliciousness, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9742

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 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 http://bagiez.com/userfiles/file/2895585874.pdf In PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d80da581a---65656516465.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/pererer.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/d75ff465df3da673dceb5a1be6826270/diliw.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4406be682b---tatajovadenex.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/msukh0c0c08oh3ons98p1lm5c4/92980506681.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/lipopik.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7e58dbe1---28280146786.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/63ae09140b354e8b9272d24958dfdb4b/58990390544.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/28962401324.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/87253769437.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f93b684efa---65601193507.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/97766253528.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6540141efd---sevulepubirebe.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab210e860a7---polawixulizigeti.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/xarijowaripozefov.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756409db6a1---52824097342.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607240e6de749---9206014620.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/139bca5ea0212f02a269687c29ddcab6/9702052573.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kg5tdhopdp79cuc02vb30lvj37/daropovezo.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/dawajopapefukedu.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ab38cd6a8---70374885919.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/xufulofapaxagodaga.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/47bb2489a6c17ba2f3040570216802f4/45208829663.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2f9134f02---98129458281.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/fcf376abfc04c276baadb2acdfa8375a/somebaxi.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/99432791515431556130160e87c0e340/6819719295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=not+autistic+butPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/Referenced by PDF JavaScript
    • http://ns.adobe.com/pdf/1.3/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/mm/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/rights/Referenced by PDF JavaScript
    • 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_off0001f8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8D6 23156 bytes
SHA-256: a4e583b8b726169d0dec08aabb411c26be8f3a8945c79dfec0203026c4a9d098
font_01_sfnt_off000232c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x232C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24AD9 10056 bytes
SHA-256: ac4878025d9b05ce59b20d0d796a8a53d9da03485a40d3c095a57f0873636d6c

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