Malicious PDF — malware analysis report

Static analysis result for SHA-256 77075fb8fc6a91df…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 14:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 784d953fe0a63a97868a187634ca10bf SHA-1: 976a9ee2ae36810ea05b985742dc862c51addc5d SHA-256: 77075fb8fc6a91dfb9a2b9dc186f8bd8b9b6ee89a7824c35be56caea8eca9c3f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://wastran.ru/uplcv?utm_term=thunderstorm+formation+pdf PDF link annotation
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc0ca4c85e---31264768158.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/a171b512d6c288e310dcd4bd840d389b/moguvila.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210704_140219.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161046832b0d5b---97031994578.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/tofipapufimafujujabadumos.pdfIn PDF document text
    • http://lulanjina.net/upload/files/narizibufakirudegagux.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/bigivum.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/5498865093.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1f9948b6b---renaverusexizumotoxadek.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/eunriton4bbtrclqftgsele7gc/44623676014.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/22689647029.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/rovuzovubozepamavaximon.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/06j474mpibh1n5jugm7n08v2l4/16733268259.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/36481567348.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/kagusowumimipip.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/revabivekifetul.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/69763030512.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2082b4f58---54471592809.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/reribawejamaludusekemo.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/finesukelebinitifufuf.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/86244015616.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/fusapomixamitexerisorixu.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c1721512a6e---26789022008.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC12 17164 bytes
SHA-256: 8f03c2fcd1c13ac33e69299b16109970e89ca5d72d74ff2bec171623055c8610
font_02_sfnt_off00012895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12895 10780 bytes
SHA-256: 1f14521f6f5b4ebb5b54129d70c1617be7835297869703f09c818e52162c3311

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