Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c91496fc5d664e…

MALICIOUS

PDF

74.8 KB Created: 2021-09-08 07:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2c7baa7d6acf4bbce32215ed35caab66 SHA-1: 2c3f8dee8bc8423bb812dd7728cdf489e9230379 SHA-256: b4c91496fc5d664ebe012ec9f663e3ca35d1f1dca4dac9b5350d31988f734fd9
162 Risk Score

Malware Insights

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

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites, suggesting a link farm or phishing lure. The PDF likely exploits a vulnerability to execute JavaScript, which in turn redirects the user to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8797

Heuristics 6

  • 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
  • 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://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/35ccc8cc02218117e30d5fabd19d3078/25340728749.pdf In PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/c3151a69460758ac644d20b4ad838a9e/52871471174.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/37379643480.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/magodazuzoduxobadapanuw.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/19474980448.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/73755209221.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/jirorus.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/17056845877.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/jotidovum.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b0b9c5bab---14909627037.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/hvlpd4re15jaguvs2cluqoki8b/wibagusuxugijomawovofusus.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/11595285584.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/jekakinan.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083625e7c173---25793681342.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da698255f5---savasiduvopadu.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/15124161166.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b758dfc05d3---domali.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1d8abc5c7---40159597520.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aba366a1d06---60012254363.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/dumanomoroju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc956c4f4bf---33478088239.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/89180587166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=muay+boran+manual+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A4 19248 bytes
SHA-256: b2eef0330f6cc29ab1d56e8669d0baa9945dbd1e973a65f336c8db33f947ca44

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