Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d469438fbc5333…

MALICIOUS

PDF

59.9 KB Created: 2021-09-13 12:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 27ec0324a1f25ba3410d30f666e1b1c6 SHA-1: ade5e1d6c8a95bcaa671ffd9bc6f5796c311488e SHA-256: 77d469438fbc53330759374695d51cf925a385c914a9cf5af9b605c15d7a63b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8243

Heuristics 5

  • 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.
  • 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=file+viewer+premium+apk PDF link annotation
    • https://senegal4d.com/contents/files/womuremipuxelir.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/ruxemev.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/samuvodasasigiluk.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/4206930647.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/xifosavonexus.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090623543373499.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1630475114.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a933c76d5d---vesarigemalofape.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eab5dd0435---botimuranudemadivo.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/xifewuzubivefubefotuj.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/58626338493.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/23195285053.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/pasuzozerazire.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161362b489eb33---wowaxasemekokadimesodimag.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/sulogumosavuzinedegifaki.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/riranalajanifaroxikap.pdfIn PDF document text
    • http://armanetti.com/images/guvutoxixanan.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/dosadaputovusaw.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/susuwax.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/refovisumemexevulezibof.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210903095117.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/perabixoxomerip.pdfIn PDF document text
    • https://dhesient.com/media/jixixokipiju.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/20304108723.pdfIn PDF document text
    • 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_off0000c65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC65C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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