Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa97c2673e0b153b…

MALICIOUS

PDF

112.4 KB Created: 2021-08-13 18:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 73bb1551e17f937c67cb949daee35255 SHA-1: 929fffee71432f98e99fc43129b5e39dab089512 SHA-256: fa97c2673e0b153bf158497ac53c55f5e90eb0964b5c074405a6a7b1678fb73a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript and a significant number of external links. Many of these links point to compromised WordPress sites, specifically within plugin upload directories, suggesting a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9433

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://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/6b80e04987c672d95592a6a424ab1d4c/25562419257.pdf In PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a63f26b6058---62596379469.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e870e477f---68331137336.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/77156652329.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a134744d430---38401222628.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/95584381509.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/10443123248.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/642560319.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/3040788972.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/61534726178.pdfIn PDF document text
    • http://hoangnhataudio.vn/media/files/89752450.pdfIn PDF document text
    • https://cmoretv.com/userfiles/15180687303.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075be47c0cfc---kesuvazudusonotiligemi.pdfIn PDF document text
    • https://camelcarpet.org/d/files/vedimejopimezezubu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a55dde49bd8---81830335060.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210715150308_1021554822.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/6ad3596d2135c5025e6104fcccc95bd9/fuguwovevogipikoniwofixus.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/75659198909.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/fatitilikazufip.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63657dc896---31806244323.pdfIn PDF document text
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/zipedapajawixufitazu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9164658ddb---punitokiledadereka.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/pusigor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+do+brass+instruments+make+their+soundPDF 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_off000198ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198EA 18016 bytes
SHA-256: a257cc1e8cbdbb80c01e9ae16420e37cbaf348244af05ff688a188e5b7b789e0