Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a8d26b5b8cdc0d…

MALICIOUS

PDF

74.7 KB Created: 2021-09-07 20:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed82c4cd0fa2ac4df6244fcb8fd7bf43 SHA-1: a4e9d788f61e1f670dab08c635789816d18de06f SHA-256: a5a8d26b5b8cdc0d0697076cbf71a7004efd43a52ff43dc3f9377eb28ea9bc2d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://samarthanamparisara.org/apadmin/uploads/userfiles/files/57743794695.pdf In PDF document text
    • http://espicycooking.com/files/file///mowoxosafowita.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f2ad798e5---51228537757.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/34930369812.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/80861319539.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/66828768949.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/lojitubugewadejudumuzuvu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ae1384bb9---munajim.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/6511167018.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c21c508def7---41117774564.pdfIn PDF document text
    • http://bjallstar.com/upload/file/paronepilevuriker.pdfIn PDF document text
    • https://beautyreviveshop.com/newerac2c/userfiles/file/lawes.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/2927645382.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/jimovujezifupadepekujinen.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210606_589F61533AD72329.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/79148909628.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/56398995244.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805f0dbf836---76381097931.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b692c65c64aa2586447042c79e921b3b/memukuvibopalapumiluwow.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5203b81c2b---fokiligizarutexipus.pdfIn PDF document text
    • http://munnarteabungalows.com/userfiles/file/74893513867.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/sewisuresebabuxon.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/9648095265.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/83750734689.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b334d07f249---mibobore.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/zamifoge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=4+s%C4%B1n%C4%B1f+do%C4%9Fal+say%C4%B1lar+problemleri+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_off0000c028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC028 11076 bytes
SHA-256: d7e5405ed28280d8f986f5d4d433d208c6ec31de627c278deeaca8aa405ff1c6
font_01_sfnt_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 16544 bytes
SHA-256: 917a2cc8e9ca54cbcf2e2f57a0cc62ac7ba0ef1c5ed23b4e1c7ded6ec606e4cd
font_02_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1