Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f6d88899b253e9…

MALICIOUS

PDF

85.3 KB Created: 2021-07-21 18:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c8f844a30317340dd157ab4cf8a5a23e SHA-1: b8510fa9a795946fc27a1537e29df4f7fef79a60 SHA-256: d4f6d88899b253e945525a029da1628157beaa6c6f103a26a2d4b327691b0df6
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the presence of many external URIs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://hotelstrack.com/bot/ckfinder/uf/files/miwonivuxevokifimoti.pdf In PDF document text
    • http://dok-vo.ru/userfiles/file/16136073477.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3caf33cf7---gajoregozer.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/682bec0e42b3c2b719f9cc6a99c25235/64846430969.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/zisegitusomu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/a510c619b0c03e9a9e942d06898e26ae/41921159953.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f5665037c---nozilodojes.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c10aa9cdf6---vatikunamijotarim.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/rulobikurudun.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d174e9c97---senitoze.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/rakexolorexekisozop.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/riwuvod.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021070704073580554.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/o3igub85j98fl0vaor00rjh1n0/nilinebawumuzubasa.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9175348ba---65070154376.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52c6d522cd---gutanilovujakef.pdfIn PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/volexovejudenu.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e9f2af788---fudukidufimonimudoworarur.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/terogojaxovigekupag.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/dd8c8d610e4fdfc8d6657ae6055b2e9b/tazajebafiresidole.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03c8f750da---nuxasu.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/57122856276.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/sekigibokinuxefusanizawo.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/b26o1j3sg8l39ehkti9n4sj507/rasabebuwesipogoralisure.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897fdbbccad---89910072883.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+remove+pages+in+pdf+filePDF 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_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 16900 bytes
SHA-256: 257d8311c8daa2b713b21d23efc29383d4de9538f4da2dec7c018e97da71c202
font_01_sfnt_off000115aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC1 10984 bytes
SHA-256: d39ca391e24b091711b9137399c513003093a6b378b8fe2a431d71e86ac68314