Malicious PDF — malware analysis report

Static analysis result for SHA-256 c941a39ae574daeb…

MALICIOUS

PDF

88.7 KB Created: 2021-08-04 18:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 38c815adc50074e6f55d5010f58050fa SHA-1: 935cbf6943a936bb332f52bbc605c8b6960e2126 SHA-256: c941a39ae574daebb533fca21976c9b47f66b5fc8c552b96d60d7638a7800ad6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://pixomot.ru/uplcv?utm_term=mr+bean+movie+1997+full+movie PDF link annotation
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772320547ef---93056105537.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/4e5c963ecf57cb45c81cada3cd8140db/89287991063.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/53308577632.pdfIn PDF document text
    • http://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/rorevegoxuruwadu.pdfIn PDF document text
    • https://tavio.ru/files/file/zikebiwetimo.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/75922834072.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/zanikajipubam.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/4276274115.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ca5e90f64c7b407a90a91d55ba9da39d/diwomokoxisotexosuzatib.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/92532676879.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/60860479464.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/fatixasivewusigamarajis.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/408630cb0342c0825cfcfe28a84fad61/majozajukabidekalisotebi.pdfIn PDF document text
    • http://techbis.pl/files/file/14502510914.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/kogajizof.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/wulanupur.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/10668440500.pdfIn PDF document text
    • http://judge1960reunion.com/clients/873273/File/30948683434.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c2a73063---56814038362.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b5a2339f8---lojapefuvesa.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160f86e8cf16f7---4500540100.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/45453595572.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/29179462351.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/getojitidijigedeki.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/83494126689.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FD 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_01_sfnt_off0000e98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98A 10680 bytes
SHA-256: 2eb57f9b182a8d7d4c3121accadd044964e7d9a6a776a5dc21912661ca67f007
font_02_sfnt_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2E 27712 bytes
SHA-256: 9f0a2fc660eefe1ad65ee98677ce3f1e8ea4ca8c6abbe40c8385892b3268a8ee

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