Malicious PDF — malware analysis report

Static analysis result for SHA-256 525653abc977b1b4…

MALICIOUS

PDF

94.6 KB Created: 2021-07-02 02:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a8ad71df9789818a9091ed54d973a80 SHA-1: 0cedff351cfd0230647bc59068204c60abda0195 SHA-256: 525653abc977b1b4dc4eaa948a1495f1cab62e233661380bdb77c3572fc664b8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These links are likely intended to lure users to malicious destinations, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2938

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://coretry.ru/uplcv?utm_term=36+questions+to+fall+in+love+pdf PDF link annotation
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cafe6b6728a---pixixurojudivo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071ae9b60702---kenix.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/11a2e78f25275019322ebfa57f8f306c/dalawu.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/zutanoraxigikeduzomitet.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe86f2fb48---67880746690.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3f519afa7---91007679453.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/4f9007980dc97adf8fbb29c0681b974d/79463093325.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/45374157f259c7d40a0d655bbc804282/takiv.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/rutegulasakupiwube.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/9c405158e8488ab6ac5bca5e9c52755a/65404477036.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b65cdceae5---sitaligemik.pdfIn PDF document text
    • http://learningkey.org/userfiles/42908009402.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed4a4cd7b5---93808673975.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/82960155806.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d66c56e9756---15394702100.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/48342702da6a97f452e3c220fce46f4c/27261415482.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609eecacbd309---tojijafajenunedivufinot.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c4f553de---riwufutiroxubomotipiketu.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/79044068631.pdfIn PDF document text
    • https://noblacklist.pro/web/img/podborky/files/tekokaxu.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/24a1fdef3e1945ca924e3b89074790c0/warotivafovoluselalenoler.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844dff8f0e1---nipuxakofobeg.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/59422110417.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/78388274323.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/nutarewirixejuru.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13512 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D24 17164 bytes
SHA-256: ede00e940f9bd27d700135984b9392d63b61ff06cb24e28be1a823945cdca007