Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc8a466947007ff…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 07:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1295e1bfe4a8ae3d0a4821528c9adf6e SHA-1: b107390d75f91dcd858c8ff7a0f1f38be5bfd71a SHA-256: bbc8a466947007ff44856dab9819f4ab6ca76b9b6e8c69ca3c9d2ef7ee3074c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers confirm its malicious nature, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically highlighting the non-clustered link farm on disposable hosting. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://yeditepegumruk.com/userfiles/nalogofomivizaziduvapexa.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411003ea1de---kowuma.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bee6c5ca2f---82331686105.pdfIn PDF document text
    • http://ttc-investco.com/img/files/fujovafap.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/xeburakifabenevumef.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475862122ab---widezexofani.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/pelip.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/lexibirutovaxizebet.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/66487920571.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/15395953438.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/39303617261.pdfIn PDF document text
    • http://recviem.ru/img/upload/40132781518.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323b06051a6---70465305643.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/lidigarimijup.pdfIn PDF document text
    • http://www.moyekolodin.com/files/genogizovinepegubo.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/zewunis.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d0ac0f78c5a9696d2cae9d78207affca/wajobovub.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/boguboriruxun.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/9070340577.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/kitudexesuxenosopeme.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/xedonugapaladudonovawi.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/dafuzup.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2d4e3d0c4---xifej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=epic+stickman+2+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_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 18640 bytes
SHA-256: 49f71409f298828452d4566478e9cb017a403d671735b9e4ec75c30bbbf4d58e
font_02_sfnt_off00011eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB4 10332 bytes
SHA-256: 428b77ca8765e5fdc413ef8a461c0b45f7e50c2327408ee74ddceac5b649f105

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