Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a7e7f366de1e907…

MALICIOUS

PDF

67.8 KB Created: 2021-09-03 22:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 32feac8fad3da6c47e6d540522252d1a SHA-1: 115dddd5c9e670a9de5171c041c7245071593a1c SHA-256: 7a7e7f366de1e907b07f85b3654ffba333456f7fc31f5d9b151a9e609b569e91
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The file's structure and numerous external links suggest it is used to lure victims to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3348

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://pistant.ru/uplcv?utm_term=dsx-5000+cable+analyzer+manual PDF link annotation
    • https://valstybestarnyba.com/upckfinder/files/vovosorusimozutap.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76191ee59.pdfIn PDF document text
    • http://thetuckerfamilyreunion.com/clients/67950/File/kegovulepipefevi.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/92155720973.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/jerotubaroxovirur.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/bitiwetijowow.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4f4259b4e---59258114430.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8ce761dce---nosokiwes.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/60mmagslvh8gq4lpf5r9bp0c52/niwokogimoliro.pdfIn PDF document text
    • http://indel.sk/userfiles/file/wefapomadirejejovijidusi.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/09f00fb04705b9294071b99738576f41/fawovewekidi.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/60716698108.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/75799786926.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f2e687ed---zigisag.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/vrgqn27io558n9iae7h5smhfrm/20082955475.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/guvamujepolituvuragi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf56e4416f---40738618332.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/5520f76dee897419adc4f42fa235582a/23460325874.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ff2aecad---57876559669.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c969901b97---9645759850.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/nepulotowelezafuze.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/19680180609.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821af16beb2---merilazujofesil.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/jusuvemomorazawib.pdfIn 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_off0000b35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB35B 10888 bytes
SHA-256: f328c802a85fbf2691e0530cfed6015a6f977a265eed4aa6a679be2b89c2a6e5
font_01_sfnt_off0000ccc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 15836 bytes
SHA-256: 1c2478adc52ef10b72af5d7687384e8ec403aeffbca168296f449e9ae9de0cd1

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