Malicious PDF — malware analysis report

Static analysis result for SHA-256 0577853867130bde…

MALICIOUS

PDF

72.0 KB Created: 2021-08-11 16:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d02d6f8a38c57487abce0ab1aba568a4 SHA-1: 71ca6c423a0068d6994f1572eebcc7d47971566b SHA-256: 0577853867130bde1e6ac29f6aed0f55a50b6203162ab8f28b33e1adf04efd22
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm used to redirect users to malicious content. The presence of external URIs and link farms on disposable hosting further supports its role as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9700

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://medvor.ru/uplcv?utm_term=computer+engineering+course+pdf+download PDF link annotation
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076566e97350---bizavokejoninowitazeje.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f49f2d0c6---2609396430.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/robemataximoxuruwelagagos.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161095a8aad7c9---kopogixarefiloxiwe.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c47858c8fb---xoxurubapora.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df1ad846ba8---73458972036.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/81136446061.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87ef9673e---niromipozipezujikevubeta.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/17977c4eed91dfa2e8b09dd8dc7f1545/gizodofolatazojeruxeru.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/nelepuwezuxiz.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e0f5269f75d1541ddece52e8b391c195/gisumirivuluj.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ba621f359a8c5fba6fe2e9c3c1cbe570/98301473915.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/33163461596.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609801c88742b---68972359215.pdfIn PDF document text
    • https://kueapem.com/contents//files/mugorobabususovif.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/tetifizemavifutakevo.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/2bd3e822720ca5a703f06b5db72de9c6/kadenogagizojajepevap.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/wamirisumaketixa.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/zisuvimirikobudami.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6djlilnrrkpi7okv8np0ve29e6/xoxego.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb78851c43---sowemikiduxaka.pdfIn PDF document text
    • https://sinarwaja.com/account/files/banosizurow.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/pkv2r1adtujfmtpvs4d9hk4vl5/51667549169.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771925da7fc---67376111604.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/6b2m7jfqh9muq6d1lufib6qano/lonazawapo.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_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 17048 bytes
SHA-256: 21b92103ed4c354e8e9d48abec90b29477e372645e801a7f0a7dd9b62048155d