Malicious PDF — malware analysis report

Static analysis result for SHA-256 782ce17626fc56ea…

MALICIOUS

PDF

77.1 KB Created: 2021-09-06 02:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c383af0f14cdbf89f4c4637baa8a9253 SHA-1: f76256079a87451f87e1d67f799178a12fa4aa27 SHA-256: 782ce17626fc56eae0229f670cc8f1914df5a14dbc3b24c96cd3ad04d4217dc3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised hostnames and link farm patterns suggests a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f762a6dc56---pevow.pdf In PDF document text
    • http://marcth.pl/media/fck/file/25219276983.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/94076021405.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/b2bfce6d83af2e064f73a994ae08e385/xenapabapupoxegojalub.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087f110690b1---86021278800.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/46341026887.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/kidafi.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e0dc0eda42f5a85687ef4462d221aa21/vijup.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/pipetenija.pdfIn PDF document text
    • https://coevent.ru/upload/files/94810293499.pdfIn PDF document text
    • http://haphadoor.com/upload/files/depamadukedosuwoxokerila.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/89215027062.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/46d7b7b2c7d8886a4e0cafc9159478cf/pawifabexuvobapizugolula.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/36851859175.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e01a3107bf33087c5655177f97a0091a/89785792082.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/roluwukuduzifejizowo.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/perewefuputolilutumufi.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/tuzawalef.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb8ab310e5---tajid.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/30bf35ee6148d5b33ad5f4831b63b6f5/67096849572.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd512dab2a3---buletaladori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=concise+mathematics+class+10+icse+solutions+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_off0000c704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 17616 bytes
SHA-256: d47aa3889a422ebec3b8b6df68c2e9d18ae1da0f756779c0f8b19c8fb071735e
font_02_sfnt_off00010cda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDA 11092 bytes
SHA-256: 6457e27bed1febb652e9e38cb9c30d8afa4c2e20320cb04295c37d15134ec64d

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