Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf55f97d58e41ab…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 09:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 879f76f7823f625c1d00cdaab89a5df7 SHA-1: 01466ea83a4f98a893d18da01f403ec5a42f9bb0 SHA-256: 9bf55f97d58e41abfeb96dcbcc5f021e758970ef419380ab9e20c4d35e011930
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely intended to lure users into downloading further malicious content or falling victim to phishing attempts. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607497035b7a6---pufejudunuvewolesazumole.pdf In PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/woxijamiviv.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/83197996852.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/sininomiser.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/wokalegolesowokofive.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0c486b7f1---36856454353.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908c161e2d1---disefa.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gororapajixuwev.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607610ecc378e---70435571940.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5e83b0c348b988a863e16d188154e868/kexivabefamajetaw.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/1b84f9a35c8030110742c80f6532da65/jujamapudizatezuso.pdfIn PDF document text
    • http://torgoborud.org/images/file/44968505501.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/guvaroraxonasok.pdfIn PDF document text
    • http://dr-temt.ru/images/file/giratuvupidibo.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/32318563472.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/wiguj.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a175d60a68c---25094124305.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/15894198071.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92103863150.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/7f3bcbb5f762157fe9cf4113a36622eb/meliroj.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/nosejuv.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/35573613293.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961157afa84---ruxesikutakimuvufofej.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210903213211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=jmeter+performance+testing+tutorial+pdfPDF link annotation
    • 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_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f94c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94C 11052 bytes
SHA-256: 3fd7b6bf989f4626d7dc17b0eacbf1f21b69913f488c96bd764a4a5718a056cf
font_02_sfnt_off000112cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CC 17996 bytes
SHA-256: 714ef189f3c96be0d905bc80b6b40e64d74bfb0d2038fd75a45a57976a006afb