Malicious PDF — malware analysis report

Static analysis result for SHA-256 617eefa2468638f3…

MALICIOUS

PDF

86.3 KB Created: 2021-08-16 08:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 17d62d7b8de3a94d42aa34b0e21e7b2f SHA-1: 7df6f395b576b6922b376a3e5919b1185101abf9 SHA-256: 617eefa2468638f31e55bc03debc485dc89f451cdf309e5ca06c7022a90ffaf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards the document serving as a lure to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://philabc.ru/uplcv?utm_term=python+ttk+tutorial+pdf PDF link annotation
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5gbsc2lcg0v4cobq6ogrb9cotj/65485547432.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/5589562561.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/gsi395kvqadi2r8b3qlphe0t5i/32276973196.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/fikubawibedukaperarem.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/a0ehuo7t5o1c3r1md358l23mrt/sezaferobodikas.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fded59069b5---japanudozenafix.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/7kj3kakrohk38u17dibpo6rnj6/fodokazakiso.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/52417738913.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/i5jitpdtqeefs3627bi3f8bvab/pixisetuponozegomewape.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/22010501036.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/oeujmjb40l1oiovf9r4o499on1/gogetunulirepegunaso.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/93927fc8fc5b0db33452e4551600a86d/68096181513.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/f2a61737970ecf51ce5f386f6f11702f/91867221467.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/xemusakunimakexuwegijol.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d7a5f10e7a19f4999977c790300b2a6b/37834351858.pdfIn PDF document text
    • https://senhewood.com/d/files/98074679326.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/5b38ab8e636acd583eec048ba72c133e.pdfIn PDF document text
    • http://brukbet.com/user_images/file/jobisebenatotogunizopunex.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/61168423560a4c12f8171d.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/f44863daee0822fd1795a8186807dbf0/89348559237.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/64944592972.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8ab2b0d042e6a54bd1947ffc4b0cdc9c/29654977739.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/3999562597.pdfIn PDF document text
    • 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 10600 bytes
SHA-256: 4241cad0bd4751046d0a3606e1fb340e9ae2e3840ebc70256c69dbacb46e8925
font_01_sfnt_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5F 17240 bytes
SHA-256: 6ec6f84102715657e2b9260071689e56799d897bf52ce6b5bafef2367441ee4d

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