Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb90b915057e6b4…

MALICIOUS

PDF

76.3 KB Created: 2021-09-17 21:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4465eb3667b51dbfe734310080adb433 SHA-1: 82066c97ef10c885bff404fab98c0699b3bc2a69 SHA-256: 2cb90b915057e6b48d605e7667f283f9476f9768a0e783efdb00135ae5680b9d
154 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which point to compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to potentially malicious content hosted on these external sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 5

  • 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
  • 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://vjlabor.pitscovn.com/uploads/Upload/files/35988612477.pdf In PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142693e248db---21086648180.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/d4422c89aff8b59058047c800d37001c/50030896344.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/18a0b9b2e4f07d772765ddaa5fcbc3b6/zebukofunikadowilewolon.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/setokamesunikugobe.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/94520655313.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/vuguwefudirekem.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/boxuseg.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4483eef5a4c47ec79ccafff95393cb70/wamipuxutetakena.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361986dc2dc---11277046141.pdfIn PDF document text
    • http://rurisnet.org/images/file/16968576698.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/jomovezubinuwudu.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/xisizisevaxarud.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351097b3547---25247170404.pdfIn PDF document text
    • https://vpmemorial.net/images/file/90396967960.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/63970612438.pdfIn PDF document text
    • http://kccmaul.com/files/files/nazosesowazafekuvuwutaw.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/11746424293.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/metalugojusibotutinuja.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/25338807647.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f08dd21381---48227656558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=dream+league+soccer+classic+apk+modPDF link annotation
    • 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_off0000c786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC786 23356 bytes
SHA-256: 058ac95144bcf89736e82ad0b684327cfc98a65607bab8ef4ac0a5f52ee2574a
font_01_sfnt_off0001039d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039D 10848 bytes
SHA-256: 86f9e24bd1b52357c02386049a055a1177e0fc857287755bc8ef51b3d930c93f
font_02_sfnt_off00011c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137

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