Malicious PDF — malware analysis report

Static analysis result for SHA-256 07acc64e9f4b937b…

MALICIOUS

PDF

91.1 KB Created: 2021-09-19 05:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a9fbc3fe5820a2dba22e46534dec2ad5 SHA-1: 62d8c66611ea7bb58f6af57d7a162d30dfc58a5c SHA-256: 07acc64e9f4b937b10058bd5ed1e74f422042f49f1c20a875ecaa164b1075c97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to leverage SEO or compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://gpe-el.pro/ckfinder/userfiles/files/boleturavobomojeteve.pdf In PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-14/20210914040725670153.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/12525351198.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138669eee488---75395352776.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/33528353388.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/sitokoregozoperusoked.pdfIn PDF document text
    • https://energooptima.hu/upload/File/litogexukonitakurisabale.pdfIn PDF document text
    • http://uchid.com/uploads/file/penigibekafuxow.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/takeduxabativutubogal.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/goxokuri.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/31677589777.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/99419614357.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/50396040311.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/30253309413.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/44194362037.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/10778928755.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/2cb326885be994833f98e9e3dfd64997/fewofomizisaze.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/kegusilowijebixomo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca1cef1b0---sepozavevunedipabisasa.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/tipoxesaz.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137757e36aaa---14863919730.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/temow.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/87728604798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=kenneth+rosen+discrete+mathematics+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 20884 bytes
SHA-256: 1448b94a0ba02ac5b5f18631857e932cedce15ac42047f3b21b0c2307763f056
font_01_sfnt_off00011785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9C 10828 bytes
SHA-256: 74f4bcc093650cfabde3d2512abdde78b40f718757a4d37ecab13fbb6ccd9e3d
font_03_sfnt_off00014868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14868 16240 bytes
SHA-256: b766e3ffc16e7301125444cebe6101e6ae3c8676e0c375447ba052863369694f

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