Malicious PDF — malware analysis report

Static analysis result for SHA-256 724d989fcf74a444…

MALICIOUS

PDF

71.7 KB Created: 2021-08-13 07:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 857bfcb6d3230c098bc89679d03046bb SHA-1: efd522ba8b2442c0211361fd105f74f4e978fd5e SHA-256: 724d989fcf74a4449e5e6d0ed7dfe5eee44a20df06d5d7b4c3a6329a0e3bdcc2
154 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern observed is the use of a link farm to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8991

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=realidades+2+capitulo+1b+a+ver+si+recuerdas+answers PDF link annotation
    • http://abpaluso.com/upload/file/7285414366.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca3c9a87a9---40515289358.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/xumukikoxixinewemomon.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8ce347847---9658955044.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210809104708.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/tonoxajuvudusebu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/xineruzabebokavitovu.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/ub16llpjft7hjmb1umqjjbjqi7/10328440054.pdfIn PDF document text
    • http://skupka54.ru/upload/m/boravifajesosoxaf.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/50137388220.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/93396636785.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798733c703c---rimeburetib.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/wozolileluge.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/95785575925.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160fc10d337308---16458692046.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/6503147246096a76d68fcf.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729e65b958c---pibudavixomolofubezezuw.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1610cb3db0a348---gisarunemagozobur.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16111b09d2c8c5---lizema.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/mutopuxosisijesezun.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/c8433c02d5b8045c6c6a3995be827ffb/99050955717.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/35414106877.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/buvoligatawovukag.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5059cb57f---27660201777.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001028c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 11116 bytes
SHA-256: a76f4be986e8f8fbfac6a851ca76e0f8b6fab1be3b77bc8e1a93ee5baf8a32a7

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