Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe88f1670201b448…

MALICIOUS

PDF

85.5 KB Created: 2021-07-20 19:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e86303413e969690a8ea77047f09d8e SHA-1: 7b93649837e5750efe20007a96ba3b8a1f8951b2 SHA-256: fe88f1670201b448f8b8a7032a778847f87a06ffccc60a7eeb286454cc033a47
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aggengr.com/uploads/CMS/file/91452366797.pdf In PDF document text
    • http://ztkammer.at/uploads/file/52113640939.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/33008668533.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/55467704974.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/khcemtoqvsn8843nfc6erfhd6s/tajujuxe.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/3939743200.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/52112663202.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/biziledabasawediliwiduge.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071f971951a5---84991801565.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210618_31D0706D5297E597.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1289c094---nerimogulibubatapi.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b33d42bc7---kuzobolaselesoranuva.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607921e2611c0---makenibexitesirup.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/crmkrog2ik5q1qsdi1agqtnkm8/pazut.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/36212311158.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a362715cddc---48231630158.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609089912771b---8766995245.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/81168691402.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/kiruvubupupula.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/18420921778.pdfIn PDF document text
    • http://indel.sk/userfiles/file/98625751676.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/zabofonoxi.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/25514253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=biggest+ants+in+the+worldPDF 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_off0000ec2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001043f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043F 17016 bytes
SHA-256: 40f1c64aaaaf9ef70d2121b954f55d01230fe0c8dddc47f64ae45e75c3d7a590
font_02_sfnt_off000130a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A8 10668 bytes
SHA-256: fb5b7581e1999ed43fe83398a943a8d54279609a3bc371617258de4571163e98

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