Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ef7c5e7c72de85…

MALICIOUS

PDF

100.7 KB Created: 2021-06-30 02:27:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f2fdd07407a1d0a793d5908bcaf455ca SHA-1: 67ae1422f4ad86968cfd5f0436ca2a30cd5282af SHA-256: 52ef7c5e7c72de85b02cf903487c4861b51324ffe0e84991da33551e4ff5f621
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. This pattern is commonly used to distribute phishing content or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://co-wemart.com/careeruserfiles/file/tebovizekorevuxifi.pdf In PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d8bac634e---88887171714.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16081c598642c7---wugudofemimoragatet.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/9badebb0204c6ab4ae7e692389a486e4/10621024230.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f291c69dc2c3547a423475b70f4602ed/jojixukalotigujibodosixi.pdfIn PDF document text
    • https://bonacorsi.it/file/11964018794.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16095296483d72---witokazurapefedufivafatub.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/aaa43152c13b56efab6104b26fd16b48/nuxusivowutozaz.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b611c4ea261---dewuzetawabeterubuf.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/ada25105b1077ce2ec94b455e16529d3/rigopi.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3653bf393---63804002673.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/9123148379.pdfIn PDF document text
    • http://skyline1968.com/clients/74864/File/pisosikaji.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/f138d2da21e17b15b9e05af8da72ad04/62149270089.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/625edbe7833ee5defbb81a3f601ff066/95354583324.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/44e650c5c89f5e88eafa75f712273f0c/80383460518.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/begusira.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/gulajo.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05bc559f92---ledafifoguloviwej.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160720cc478af3---71221534373.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/40929945832.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/a30dm1lb85aojdfevq2iu0nf61/zuwisasaxeb.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/gavugefatiboliluz.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/dodopawulesitaratesapid.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3fa9013b7---52608845034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=square+roots+1+to+10PDF 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_off00012637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4E 10352 bytes
SHA-256: 46ec500f2c6792dfefba62c64e39ec697c277485a29912f6b2a4439a0c764111
font_02_sfnt_off000155d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D9 17740 bytes
SHA-256: 3658bc5cae77783937892b0225dcf7082361c476a39ef9b31a50b00862d8b2e0