Malicious PDF — malware analysis report

Static analysis result for SHA-256 feaa984339f99b08…

MALICIOUS

PDF

71.5 KB Created: 2021-09-06 19:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a36ef46863ce9a26053ac342691cf2c SHA-1: 6ae99072f1b548638679200efd3a8fa6ef424f20 SHA-256: feaa984339f99b088c11ef2a987f64c119aad78f4218d753506bcb569b244d7a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites, suggesting an attempt to redirect users to phishing pages or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a large number of links on potentially untrustworthy domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://menu2uplus.com/images/file/26011869465.pdf In PDF document text
    • https://n-v-v.dk/userfiles/file/73043523817.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/60254757065.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160add353bdc9d---fabumalopuxudatijewu.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/d36be4416fba8dca2b57b39b723f7770/43639614417.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d82e414c92---68325600768.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/xogan.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080c99073c06---jawewedavixuduzajovatesef.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/12620579659.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/7htdc2h2437ktlemlmlh9kdua3/96952439887.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160905571c11c6---54536173950.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/5785589984.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161216cb1896c3---kamopu.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/kigavojisine.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e972a26e222002dabfb24006c9d8ac04/39144031334.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/kipuxupovulurabiwaxidol.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/2b417d3855fdcf55b8010a5bffa1560e/90462167515.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/denonerokiselon.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/90754307776.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a39a41ee32---3668778723.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210730_C95BEB195491DA27.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/72023807339.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/6690705982.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/74072652234.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=broiler+feeding+program+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_off0000b8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BF 15740 bytes
SHA-256: 03c716cbff547acd4c05f0b8f7cb0267ff9d17d6bf2f13786b65786b42be6560
font_02_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 10628 bytes
SHA-256: 20f789ec2a4356840caae32c0befbea2ca75e469ccaa8751e759cf50bf674463