Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bf7585f6619654f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-10 02:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 0ccc6f9a6a476ee7a53e88b3fc019959 SHA-1: 13cad606fc922e09bbdd2d95594a654a226766fc SHA-256: 7bf7585f6619654f6ba3fed23310f4096c38ed94823952bbc50b8e2cc2be60d0
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection for phishing. It contains numerous embedded URLs, many pointing to domains associated with link farms or potentially compromised content management systems. The primary function appears to be directing users to external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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://top-caster.com/userfiles/file/mosederajokuraz.pdf In PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/jomujuperubufaj.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/94724605060.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/14152572364.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/r2d88brkrdjm5ql27a21k3ntgi/letatu.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/82305241900.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/18929999212.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/xupebojazinexusoxo.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/mujavevitibikedorediju.pdfIn PDF document text
    • https://somogyplusz.hu/files/vegidoroxek.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/38043247715.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9d01c1a4eafd68b09b8b9ee7c847f7ec/40079251175.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/14834381516.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/soxom.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/83916804187.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/507bad5595511c3912ec8999cab99194/ruvofokasineromikuteri.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/83952015412.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/84281828594.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/vivuzoteromutigujijat.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/gofinaxufetijalufono.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/50108845848.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4425965408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=media+server+for+firestickPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/28571669424.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_off0000d570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD570 18228 bytes
SHA-256: adcea6dc78ca3adbfc862b20002b25d71e1e419ed257ffc458f6c911592aef24
font_01_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEE 10468 bytes
SHA-256: 1e5c91028a85bdf486b7ba44dd13e6aa55fd95e6d339390fd5c7d9adcd0665d3