Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce652faf93c1e191…

MALICIOUS

PDF

73.0 KB Created: 2021-09-25 20:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a5bbfdeecb9c165670f035036af38ffb SHA-1: 97e3c496b812408d1625b27acbbc49a2b658538c SHA-256: ce652faf93c1e191bf072a63ac94c534ee979ad5f9f02feb0bd9fa5a07c77286
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://zekidilektekstil.com/images_upload/files/18003868421.pdf In PDF document text
    • http://energywork.pl/userfiles/file/rurujafuvujusuvuvowus.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d9dcef47e---93176808073.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/wetenoginetixuvisesor.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/47350544016.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/gogotuburinupalerijanesa.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/zexudevima.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a7473df49f5f5ceb58fe4985bbdabc3f/39999664273.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/25094900478.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/77380110027.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10310519848.pdfIn PDF document text
    • http://smileorganic.net/smileorgfarm/filesupload/File/mojit.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/pizadixalavotobureg.pdfIn PDF document text
    • http://castel.lu/userfiles/files/razatiwowazanixafojaki.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/21186904080.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331b30b9370---30670622235.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/bavemuwupuda.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/dusarowim.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161343ac23f8ac---wapovonazevam.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/zokodukujikepepu.pdfIn PDF document text
    • http://nprofit.hk/userfiles/tuwusapapanidemi.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20210905055710.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/17910966609.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/wijimoderumut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=implosion+apk+fullPDF 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_off0000ba81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA81 10332 bytes
SHA-256: d21ba7a4c144ebbf1fb1b58a05e1143f4d0743e47e22403dc343b5c5e201bdbb
font_01_sfnt_off0000d1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D3 17584 bytes
SHA-256: 7f4551ee3ee6634a9bf19694ecc69641defd6c5e233bed36d86e36e4debede55