Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b34f0dbd0a3e92…

MALICIOUS

PDF

78.7 KB Created: 2021-09-03 16:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c3f218c6ad0c4b633556f5f39269592 SHA-1: ff4ac62d6b2bc7ab41c0d06fd5afb3bcfe9db333 SHA-256: f6b34f0dbd0a3e92e9569618df043a5e47aa36047977cd679d826cc4cbdfb4cb
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and link farms points towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • 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://clubforeducation.com/FCKeditor/userfiles/file/89937919068.pdf In PDF document text
    • http://biirbeh.mn/images/content/file/81093439853.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/d77638cf8ebfb1fffd1e588595ca7ce1/95694695116.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/8kdm5hnnm4l4gf6q56e6belhdi/jesufimunufifokos.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/barajor.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/mumuxa.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/14129611328.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/purezaj.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/n4e39t4bupmrsqud6u5f88crj3/76829373727.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/zefoneguwibiroxepal.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/82551476765.pdfIn PDF document text
    • https://sukaunited4d.vip/contents//files/tilefenepokiziroke.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/gowanezasisi.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/ketufojixaj.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f40a587699---15246203490.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/9a3eb3ec9aabbec5358ca4109659d51f/24736999562.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c558114f5de---65197131673.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093a20c4d3b8---92750746801.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ad1f6df47999b7e84b3c59ada43d80e9/64582914972.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec73c33c7f---sapubawedonomufedi.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210530050340.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/pupokosarisowiliwokoki.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6398b95dcba2a2f04c8b5a7486fc2709/poruvimefajexeg.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086833b5c73c---bepexofevopetovajase.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9ecb5543c---80150235436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=thomas+edison+timeline+worksheetPDF 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_off0000d0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 17308 bytes
SHA-256: d9e536059e0a3a0230a8e987267867521fabe84f35c1fc4fd8e463b9650ca7a0
font_02_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 10652 bytes
SHA-256: 87a29efb78d48a4d3368416caa98c1daa86952969f97c3c850a287c3700dd93d