Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5a6d0d782c4991…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 14:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 62800d30f1586a742ea3ee0bdfc9ac5c SHA-1: e76f5ee8d6677abb9e93a8fa3be8aaca06aac32d SHA-256: 7a5a6d0d782c4991d484299d65639e2eb11f8c18c559dd466e89d5fba110b87b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm, with numerous embedded URLs pointing to other PDF documents hosted on various domains, some of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's part of a campaign to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://penal-garazh.ru/files/10716072442.pdf In PDF document text
    • http://hoshitorionline.com/uploads/files/40231116045.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc45455e1e---firujo.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/790c79fe5c2c9dbf3ae886320d997245/meveragewebugo.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/kamufatalixizilirogaleg.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a4f8cfdda---tebufibivojuwerugojuwujuj.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/bowefamevitawerejekoxevad.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608394c052a27---solopumivosin.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78d9b4b1de---voses.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/2d1a89501106c2b304783894904492d8/bavasalofubo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607644d82a1df---73111209137.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210725_111243.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef9acba07---82599392788.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/lijutapit.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/gozudadadibu.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/vutijolavusuduno.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084cb8238646---jazikemiguzositi.pdfIn PDF document text
    • http://southport1969.com/clients/861680/File/97805476189.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/33265410324.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/97423896300.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/zijeliti.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/esfjj4cemd4lkoplmcn7b26ir4/97677002925.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/ecddd27f58450bdcb8d026a7f69ee7a7/borudapedufedulak.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/86569827841.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/16863534876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=communication+theories+perspectives+processes+and+contexts+pdfPDF 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_off0000cb21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB21 11140 bytes
SHA-256: 1d591cd8ec68d758df3959375a505703bbc726d52b510b9f0cc86f02d2d1dfbe
font_01_sfnt_off0000e50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 16868 bytes
SHA-256: 51acd6f6d0c7ee9d50905987db05bb8f286b761c65930987ba60cadbb295d2e3

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