Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ba364aaad7cde29…

MALICIOUS

PDF

70.8 KB Created: 2021-10-02 11:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 26f1f18e39224d993051a3c7e5b822c5 SHA-1: 3a3b09594ab8426e47e3211d91a6e1129ca7790b SHA-256: 0ba364aaad7cde29dd15cfe9d64b63371ceb4e744f66301f16a9ea576c47624a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to disposable domains or compromised CMS upload storage, characteristic of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classifying it as a phishing trojan. The presence of external URIs and link farms suggests an attempt to redirect the user to malicious content, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrabud.eu/fckpliki/file/pigekirikerivolomoxoxam.pdf In PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/rokideliwuwigadebo.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/sofikulote.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/4409051856.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210929_B9C54070FD013D43.pdfIn PDF document text
    • http://unityproductions.com/upload/files/ledizosonurapesikegulekon.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/27964033674.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/nigenivixilen.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/10609457095.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/ginojaduwalulawinezut.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/77767278313.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///nitovutomuzumadobezudivi.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/61091419845.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/zutufejorivo.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/b2ba4f282f8927fc777f133086911d77/87632447905.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210927222358.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/dopatenaripikipafe.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/tetinagexo.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff18199cda---rodalibukelekumorarid.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/159242a303190424db6acbe7137392c4/jojuki.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/20266651652.pdfIn PDF document text
    • http://www.og2c.com/images/file/tavetinivomufazamobeduf.pdfIn PDF document text
    • https://raljob.com/userfiles/file/figabezakegiruti.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/65ec591c9144d14761afb19c63dbdafa/69497949036.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/14729489156.pdfIn PDF document text
    • http://195exim.com/datas/files/mibifagipovavopokuluwod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=read+the+crown+of+midnight+online+freePDF 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_off0000b20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1D 16188 bytes
SHA-256: 44070bfa93a29d9aac1ad2617c4cf8b80d422b3197048443b27bf26a92c27d0c
font_02_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 10888 bytes
SHA-256: e238eeeebcfc731a14cc0228e689cf07abc6f723d5a810c35816cbffc300a193

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