Malicious PDF — malware analysis report

Static analysis result for SHA-256 c117a3fbf68b6425…

MALICIOUS

PDF

92.0 KB Created: 2021-09-02 07:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60e0964c30cb29333e578fc4e469dccf SHA-1: 78569003c2c935075f93d8753361a29506519c95 SHA-256: c117a3fbf68b642575130f814d8d9bf0c55cf6a4729d84721b8aced863e87286
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 WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tsegypt.com/file/zuxogibin.pdf In PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/beb8585e542cdd0f3f209ceb8bb7e1a4/vibanazavitudadi.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef4268eff---59806246779.pdfIn PDF document text
    • http://sdes.in/uploads/92262947741.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/sesas.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/280ffgleb5tet9jtqo0bmb6hl4/83838279064.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/melekemupadaxeg.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a23427bab---tagaxekibakanexuxajop.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/gasunerosuwo.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/42816339026.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/1416015132.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1182c64b8f---17155530228.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/d07f31e5d958d4477f39561c3a501b99/5125368630.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/94821170536.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/cv3akc13f679ephdj3n2rg329g/gibukurogeja.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/35946393395.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/08bdfa99633ad0f9cd8f49287f0c1a5d/ginomopefol.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/mobitajavukimotof.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/bobam.pdfIn PDF document text
    • http://canadanur.com/resimler/files/rudojefate.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/xelufokakovasakigirib.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/lufodore.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vnuet7embn1m5qv9pn8rgd80av/14759134130.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/84443019583.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/44784590996.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/pogibijaxeletasomum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=indian+deviled+eggsPDF 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_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001187e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187E 10124 bytes
SHA-256: 9c2fb8e44b63e817ea156bf8b76a2c522eab8d2164a3b9021ff2b84fca7cbc97
font_02_sfnt_off00012eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EEA 19664 bytes
SHA-256: 201d4c63018c7540cf2f6324a2ca60b1a1d07900d91df73a127330c15a70438a

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