Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ea74d08704d238…

MALICIOUS

PDF

71.2 KB Created: 2021-08-30 14:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa96da8b6dcceb6d2ce2cf13bf0dd635 SHA-1: 9c98e245429e6f6f624753b5037a33fcc7188305 SHA-256: 24ea74d08704d238682b94b57b24f6566fdc815eac145833704fc1bf39919aca
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fly.no1-yes.com/userfiles/file/dopaxet.pdf In PDF document text
    • http://arniuniversity.in/ci/userfiles/files/siluja.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6218d65b5---numedafijilosajo.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/zekalatoletapob.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/gevizevivelevet.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/lobadaloxixozadasiji.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/tadokisujofugixonumezi.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/fn70rl9tqdrl1rlsc7t5tj54eq/27894566245.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/jagotonelesiboxu.pdfIn PDF document text
    • http://blatt-gruen.ch/files/55470278004.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/288smibjdiqmv1bgvl516mpu7b/67417892262.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/xijazamajopamurusutijoka.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/kkn1tit36i7e1jag6d1tpqp822/vamokelujupotapa.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/86004911612.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/pigodafujux.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/8862465043.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089e0e527b1d---98743599610.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/pefigoledub.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/3103580581.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/pufiwokezapuxawifo.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/feruzavag.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bf4622970---livubexepubanusamoz.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/nqdlip9ch27bsljt2251vettl6/97352269512.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd10e950c6---vutulerizukodidoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=early+foundations+daycarePDF 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_off0000b98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD19E 14604 bytes
SHA-256: afa34ca6cafaa9f27da1616f8de2206d3825456c2a1e1500e87f2bdd29dbc082
font_02_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 10664 bytes
SHA-256: 43c4f4ea6754006711c36aa16d6b3a1a9b971e549af5fc1555e90402351237e1

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