Malicious PDF — malware analysis report

Static analysis result for SHA-256 28bff09ca7b66c4a…

MALICIOUS

PDF

97.1 KB Created: 2021-07-02 18:55:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f8a5f95ac2243b43f5dfaeef379bd27b SHA-1: 9c7a1eca59c98481f36151b30bfd21294012120b SHA-256: 28bff09ca7b66c4a0c5de7db5641f26ccde79ecccce14e950e80a19a909056bd
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.1876

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://alpha-cp.com/userfiles/file/71190410837.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8cfba9f868e8feb48c9c4e2517b3b070/10299050582.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/22944031115.pdfIn PDF document text
    • http://usmleworkout.com/files/file/fozosade.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08fe242694---55064829417.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/mivulikagejesupatipesuwu.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/53688929200.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/lasate.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4d7bad51d534eaa54f2bdcae17da33ad/93003398254.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/fitabujexixebepusitobino.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdeea227d5---tatevezejudeboxufojonupim.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/575009e889ee9412fb5f6a2281ee27ff/92133505285.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086af2f29dc9---64588056186.pdfIn PDF document text
    • http://uci.ir/userfiles/file/87344123479.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c64c708af00---bapalawarotezapuj.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/c1c300b8a6cb283de86db60b882d804b/zenovutanujejeb.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be299137505---lositozaxelozomivul.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4e0efc04910b6c49777b4569d3430918/74408922374.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94772d5b86---38302738174.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607af73c265e6---rugovuwano.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/71216d2ef8c9f2ba414ea1e5195f96fa/20022391300.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c53c34f0b5c---jufutina.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2892c8e911---15144823523.pdfIn PDF document text
    • http://coumert.com/images/file/menumevojubafadizev.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5913ade6df---lukanif.pdfIn PDF document text
    • http://arslanemlak.com/E/file/kiweda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=postdoc+cover+letter+templatePDF 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_off00012cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB9 17296 bytes
SHA-256: 203969defce2d1378a252440efe0ad276f47c1d78acdff1dfadda4e6f4ee107c
font_01_sfnt_off00015985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15985 10544 bytes
SHA-256: cacce57be217b1dd83568804768a64823a586983d74aacbf2d7b8e7995c4ff02