Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f519bc506a166ef…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 01:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4740f8b4ed1fef6eef3e936567a43fd4 SHA-1: c87ca31e376a91b90674165468bdccc153416580 SHA-256: 3f519bc506a166efa902d2f8dbc854c1606ac9b9a910f2ad2b49fab49c832878
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7043

Heuristics 5

  • 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
  • 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://satyavnetworks.com/fck_upload_images/file/rolozitateguvu.pdf In PDF document text
    • http://abwva.com/uploads/files/74614831274.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/75816022686.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/fawis.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/3685954416.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/bcd78c4fd852579c51a22e57e6db76db/libenijobalemofid.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16083196ebb7b3---ruzororom.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/b37382befb32230727b03fe2edbfb211/sakufobabupusufidizelejos.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/17522756368.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a77dbeb499a4f212df3b5c4553d8734a/31499512365.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/81732157902.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/9564295ac6e0229fed0fddee3060294f/gujifozunawab.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/kesalof.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/zumubasibupiraso.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/kazadikopozupe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f88efcd7131---lamanugise.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/rufoxower.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f20d879d5d0---dikoj.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/fozux.pdfIn PDF document text
    • http://yilip.net/userData/board/file/35501289242.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dd244ad2b---43013534393.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/55178286753.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/c97c5cdff8f54ac33e6ecbf58aa71ee7/zakukalogazibuxore.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/613d4e178548248dce260f3ae40bc046/29511908345.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/garuxon.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/57426277113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=iso+14001+revision+2015+pdf+free+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CC 17672 bytes
SHA-256: febdd7891d59b573bc91c39adbc8076f65eb7fd55e6d0b247c2d00b8e77d7860
font_01_sfnt_off00010407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10407 11000 bytes
SHA-256: 99965b8a9f6a21dc5f7e397c90735fafdfd215626739dfb8cf8bb9744f30d425