Malicious PDF — malware analysis report

Static analysis result for SHA-256 389c47808ecaa004…

MALICIOUS

PDF

99.0 KB Created: 2021-10-04 22:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d6a8b4853e08490e50f4fcc4cce5d697 SHA-1: 2a79d384aa74f1ccaf082fc47a5f07fdf16ac38d SHA-256: 389c47808ecaa004b741071cd0e3d96678635257c18d9fd99f1a932f4f97c968
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://catamma.ru/uplcv?utm_term=autecology+is+the+study+of PDF link annotation
    • http://daindnc.com/fckeditor/userfiles/file/zolugatuzovezif.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/6153350324e82.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/4993156261.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/nopimetu.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/85763744180.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/bunuxutanejasi.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2835cad7050c78cc2bae9636f0accca6/93974080310.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/sezefetigosinadekofumig.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/zorulelibabug.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/webokogelagafavalarufokit.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/95273762392.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/66435611079.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/zoriwofakinobon.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161503474c57e0---59039680072.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/sigumerapirugaru.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/zuzukepopizuvena.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20211001_20FB40D52D804B2B.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/31697627208.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614097b6374c8---pujujeradidevuvofa.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/70687044619.pdfIn PDF document text
    • http://geasit.it/userfiles/files/supovobisekutudijeno.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/kikovupabukibulaja.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb5cb195d2---13682393072.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109280016008789.pdfIn PDF document text
    • 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_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AD 10584 bytes
SHA-256: be45106dbce2cfed6391e6bc62da5dca7a7bd1a586587f004d49e4f5354c761c
font_02_sfnt_off00014cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD1 19504 bytes
SHA-256: 17f6f066387f56de2ea6e88828c7d8cc4b64d79cbad2144e061ab348c664b6d0

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