Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ead260e7925aa0…

MALICIOUS

PDF

78.7 KB Created: 2021-09-16 21:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd450d352d7a133fc551aaec65538b11 SHA-1: bdb2f8f80a59ca83b05c8762c310a4b6a0396c27 SHA-256: 76ead260e7925aa080f42c4626bbd7562086605bdee0945ab9cb58563df826ee
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and the ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the overall structure and heuristic firings point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huzatfokozo.hu/editor_up/4309886942.pdf In PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/puwegi.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/8o6mg0rpoiotbq50ni07ckevv1/39714969543.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ac7bba89---37407388696.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/vegezelemenalepenavidana.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/64855293453.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8209bbe78---7609465339.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/52133995097.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/21510835094.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/tolimeguvuxibozokitaxisod.pdfIn PDF document text
    • http://keitbg.com/images/files/50275018700.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613067e04e86b---71818661558.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/zotunobazuma.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/joxepubabigo.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/nivizusadofapazojuki.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/tafegulibogeravusogafan.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/64206706259.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/40209939334.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/1440236624.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/birawekevep.pdfIn PDF document text
    • https://digireg.ch/upload/gujivaril.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/jolevujemosuni.pdfIn PDF document text
    • http://capableapp.com/uploads/files/742028944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sport+tv+live+television+apkPDF 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_off0000d10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD10E 10476 bytes
SHA-256: 2c27483be78a36f1ad6e8690c1604dbeef8f05a4de34dacf95432fee47529e8f
font_01_sfnt_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 16988 bytes
SHA-256: ced6f3aae832e8d5248042ecd2ae42c27ce03a0e9a7d0ed8703627fe59bbe961