Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83210ab57442f00…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 23:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2749d7257c5273da989ad29c90de36e SHA-1: 5b5b2da77b0dea4bad6c306dfd5aaee9f3fd20c8 SHA-256: b83210ab57442f00d88a648c1faaba8ad72ebe3cb72206df24402a50a558b5d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://assistance.uz/images/shared/file/rifajukek.pdf In PDF document text
    • http://come2menorca.com/images/file/xijedopaniponokudotis.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/777426b70d68a67977accb950643b784/loboxag.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/sipaxejabilabuwakufida.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/icb5ubl3p5221duma0uviml6k2/20690499403.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3fb9c781---xulejowusuguv.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/zifibifap.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160e4033b9005f---xevuxuf.pdfIn PDF document text
    • http://greenbrier101.com/userimages/revewato.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/vapazerufazemokex.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/pokopobasotado.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16126daa39696e---webekumupitepojulusiwozen.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/40581087340.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/8100edcbbfcb729409800353f00688a0/68848349672.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160729b228e2f1---48082529014.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/tgll5aj658k6tf1m8ljoqfpcgo/85755268346.pdfIn PDF document text
    • http://innotack.com/userfiles/files/basifenekizufadinogetu.pdfIn PDF document text
    • http://alptw.com/images/files/25458652678.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3f7df685c4cd023d3bf2f627149f7f51/64131624143.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/87041716213.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/lonoduzariz.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/45017479908.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/lawuwivipiwew.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/135a8c27e5be9de69b4d3f29e4f1d581/gejovuvavomuratuzetewes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=red+light+cocktail+barPDF 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_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 10656 bytes
SHA-256: c2391efa749952faa8f99417347794b73d36eec5839d8a783f0df43e0293e9bc
font_01_sfnt_off0001079f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079F 19196 bytes
SHA-256: 3a9d58f41fdda98df372c739658252d8afbd58f843f5003bcaa5b8aa9a24d339
font_02_sfnt_off000139bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1