Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4cb1333664b786…

MALICIOUS

PDF

85.4 KB Created: 2021-09-13 11:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5b03fbbce9570dd533c47651c41be0fb SHA-1: 649026e669ece63a9f37f377205103c2699ccdd6 SHA-256: 8f4cb1333664b786497215c27db406762eb3db43039f42183aedae542f409df3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with PDF-based lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://genarchi.com/data/temp/file/rololavekukemezatud.pdf In PDF document text
    • https://bellcera.60km.com/upload/files/rosematizajewe.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139925965929---1535225046.pdfIn PDF document text
    • https://windsbs.biz/files/file/jakolipotom.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/kaburubaxokutola.pdfIn PDF document text
    • http://speaklifeiamgreatness.com/files/files/sikusesorabuxigefowodapo.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/kejagi.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/28635590887.pdfIn PDF document text
    • https://mimpi1pusat.com/contents/files/51135677300.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/33674885173.pdfIn PDF document text
    • http://maidichike.com/upload/files/14949109434.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/motoxi.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/58280038055.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/31971910230.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/90350808957.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/fomut.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/44211079728.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/90292636542.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/d75d7d634c2e40eb8e988742b5f88beb/kimujozerefobabisewas.pdfIn PDF document text
    • http://chamdure.com/DATA/files/judedep.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f5132ab8---45323098458.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/52274959776.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090907484847.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c18a30e96b9136312acbece986e5805a/44156888710.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090704521738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=a+power+mirror+apk+download+for+pcPDF 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_off0000e097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE097 20532 bytes
SHA-256: e9eed66c9035e2b1e4bd3c2b6520d0081996ef211dd5db048348bd362ae58360
font_01_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F09 10672 bytes
SHA-256: 96b322ac6399b8c3e389fa77aa08b924eb1a71c50b7bbd35401841235780d7f8

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