Malicious PDF — malware analysis report

Static analysis result for SHA-256 1787cfaeb48152b9…

MALICIOUS

PDF

116.4 KB Created: 2021-07-23 02:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: acc0a2783393fe4d8b84c50796cc8f57 SHA-1: cae8664507fbabe06280cbb156650f94b7295139 SHA-256: 1787cfaeb48152b965cc491008de99683c5f8227290b4fe2ea23a51f0022313c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://schokozentrale.de/idata/lunozu.pdf In PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608823c8e4c86---91364093653.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/62104195142.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/66903016339.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/e90ae0e7c2eae1dd48f5f2d936c8d92e/duwewijoluwafazigujefug.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606cab9809d6f---99481442176.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef2408f99---zikozivetipuvifebofax.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/386aba1e31506e08e9e005646f2aaef3/84649755758.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a435bb8d82---7834094054.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/40483906586.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8269dd0d1---12125723733.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bepufagojemukufejutomuf.pdfIn PDF document text
    • http://nsureunion.com/clients/71556/File/49533655968.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/4203d359dc46d4f35ba418149e6ffc1d/jokupexuvejal.pdfIn PDF document text
    • https://bak.vn/upload/files/79859022103.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/dedaridigupokilefok.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55819bb65---wigokidop.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/40411984847.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3e8c7b2c48005b6db75cce7bf56a3dad/nugofez.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c69a9e05d---gabenasi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/vgsput0v5ss6jgvn8t2vm3oiik/96009246498.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/uleahhhf1opfklbkfb21pklulc/53647743806.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/867c821498ee3b48e7cc14cbcb307ed0/73982654490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=central+angle+of+a+pentagonPDF link annotation
    • 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_off0001598c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1598C 10304 bytes
SHA-256: 8ee029e1bddbfaa98fb6abef4f6cdef6fd56a05847bbe04201d2f66229a60609
font_01_sfnt_off000170ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170EE 21792 bytes
SHA-256: d1148737dcbe1cb5539334e3e2cf8173026cbd20598d47d8afe09f67a327da13
font_02_sfnt_off0001abf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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