Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9574cd07f7c915…

MALICIOUS

PDF

77.3 KB Created: 2021-09-24 23:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1197470b3492424f6ba33831b276f4be SHA-1: 43b8ee7fd3fe332446c60e14a060b101614df7b1 SHA-256: fb9574cd07f7c9153942be4ff5b13c0eb854c8a2305ac6bf8976fb9a30348e5d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and link farm behavior are indicative of a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bluelakehomestay.com/uploads/image/files/4131885510.pdf In PDF document text
    • http://timandlor.com/userfiles/file/61147914788.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/2400929676.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db6f14b4a6---69104894971.pdfIn PDF document text
    • https://pellevah.com/upload/files/18273944113.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614242da7fa32---virupitusukuxab.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/kusefozoruduwupememap.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/45813060101.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/tubusilokafixiret.pdfIn PDF document text
    • http://samarthservice.com/userfiles/file/ziveguporaf.pdfIn PDF document text
    • http://citlak.com/admin/UserFiles/file/xajabazasabopomilul.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/biwijifun.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///63464166578.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd48e322d5---zomamakovolajavodexewiko.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/zejuwojakosetu.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/h8go5kc6o2l4qav7pd6gck79m4/zovosorowa.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1d3b0dffb---gedagifikavikudixeloz.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/zanowikesolugapigirezus.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/30150444863.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/28944915286.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/79711283394.pdfIn PDF document text
    • http://receptlap.hu/files/revina.pdfIn PDF document text
    • https://dptech.vn/uploads/files/81475794087.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/71459756913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+alchemy+of+human+happiness+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_off0000c197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A9 20296 bytes
SHA-256: 1ada089c2170743837ae7a7a8b5dbee4de74e3cc1be038b42367cc5210ff778f
font_02_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 10864 bytes
SHA-256: d2ff07c40f10ca83e5273f83e4a3e8d0324d30862580d811db7c39d22791f322

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