Malicious PDF — malware analysis report

Static analysis result for SHA-256 091bf34ff49076e7…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 13:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b711c8d9b1b1749df5524fc11335dc53 SHA-1: d4ae9a7aa1e05c8a7cc48efd3a764b1c624d8fd5 SHA-256: 091bf34ff49076e79d5de5921adfc2abc27b86d77d737e01c0fcb6d1211d9c07
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and multiple URLs, including one pointing to a compromised WordPress upload, strongly indicates malicious intent. The ClamAV detection and ML classifier further support this, suggesting the PDF is designed to deliver a payload or phish users. The embedded JavaScript likely facilitates the malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/uplcv?utm_term=io+games+online+for+free PDF link annotation
    • http://sun-tes.ru/files/file/begixud.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/46196207835.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349cbef362c---77794008342.pdfIn PDF document text
    • http://czyxchem.com/upload/files/79645146532.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/32747965460.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/dekuzarexoxaguzule.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/pawiragatitimolevixofap.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/94029617544.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/jepiwaretexedosawipuded.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/fafoxuruzofubuvojamafaxe.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135427d8ee4b---luzanabepitotimejunejaruf.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/96097699983.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/warogobog.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/28724970427.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387cdeeef71---duxuzabitusakawagevotita.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/4889849767.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/vovonulopekijol.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/madafopewitasimobizexitu.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/jetuzifujeniwiwoneja.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/37238469378.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe9262cf3---43495549416.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/75175961924.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/45671983399.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/jesunu.pdfIn PDF document text
    • http://jinsonmetal.com/Upload/file/kibepijikijitol.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/44253955170.pdfIn PDF document text
    • 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_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 10412 bytes
SHA-256: d63a6ebfb9b0c7635d4aa361c3e43c35c409172fbb316173027cdbbcd1e1c266
font_01_sfnt_off0000f8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 17936 bytes
SHA-256: fea829e230986a17bacdde5745ea5e798322a5826d598316312f6d56677c7c23

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