Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b22eb26f0281fa…

MALICIOUS

PDF

68.9 KB Created: 2021-10-03 13:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b1b3ee75036350a14f56611fd021b318 SHA-1: 8d589402266eb832037ff568c7fd44eaac67a6d1 SHA-256: 29b22eb26f0281fad940e9c2a5864b2f551ddef7fdcc001a9dff63c12b426354
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kibledergisi.net/resimler/files/39569795095.pdf In PDF document text
    • http://schodylux.pl/userfiles/file/53976194035.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/sizajopamuwurisemenuripo.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/59321158753.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/bidatu.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/pegapumularetozareri.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/fodazumepidelotigogugikow.pdfIn PDF document text
    • http://stl-hk.net/userfiles/79961039531.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/af57bcb08d9bb11fb48c75d965cc911f/gegadujexi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613643fda1793---57745875852.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/88542685969.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202192514563028.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021f02759c---matibopedujubopojemota.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/muxufirineratot.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130cc86d7e6a---xunijul.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/42043698542.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/87988631449.pdfIn PDF document text
    • https://coil.hk/upload/files/kewasiriguzuruxuv.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/69277943821.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/komuwa.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/93123724163.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/30493430115.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/zinoluwojukawirosagidoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dave+clark+5+glad+all+overPDF 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_off0000af72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF72 15572 bytes
SHA-256: 05bab18cfe1432ea9403dcfd9a76c777ac88fef905afbc1286581e230aae8210
font_01_sfnt_off0000d6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F3 10376 bytes
SHA-256: 945f368af6773c4b6598f3deead2456ada404f8369ca930658706d535d314ffe
font_02_sfnt_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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