Malicious PDF — malware analysis report

Static analysis result for SHA-256 c507a090f7200779…

MALICIOUS

PDF

84.5 KB Created: 2021-08-27 10:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c119eea9e45d63b920c9f57694cf57f2 SHA-1: 4a723b6951b015dfe537d786d4e9587e51a3a7d0 SHA-256: c507a090f720077902ec158544b4cb29a4974c7391a4f3d24f9afee067143eed
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. These links likely serve to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7145

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 http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92a7e50c23---dutunabemidolalu.pdf In PDF document text
    • https://dudikom.pl/userfiles/file/6224602700.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/11379516407.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/vikusugepeba.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87dd371f8c---62433095381.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/tobine.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/pixanopobovexulak.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/67607493507.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092006b3d705---20461817413.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/26343662312.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/vuxugubexoguguputawavaka.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/2e93b287efa45b0ecadb66cfda339bd0/31671920283.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac794cd7b51---93692519883.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/e836fe19e07bbaf1f4e10304ec372572/92063357631.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/mamonezipusag.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/a708aabfaaa2f3e5254929ebd4368e52/25783371082.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/xurevodefinalegivefigebo.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/qfv6jt1i78ri8s5dlqi5svlatg/4106065746.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/tejovodoxil.pdfIn PDF document text
    • http://exantusfamilyreunion.com/clients/9/96/968554593547eb574606130639276270/File/80967870790.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/50e129c03bb8964dbbedf696d6db1956/wugixosa.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/dn6dvf0bj7iv35sm27r8q8rrl2/funitukogumokadinad.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ip5ctli9u7pmn1cu6qih0pd885/pipivilenukunegom.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082ffe6b8097---fotinevudez.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/vusudeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tribal+cultural+minorities+in+the+philippinesPDF link annotation
    • 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_off0000fedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F6 10844 bytes
SHA-256: b886cd84afa4d25e71b8b115ad69ae553c38494df23bd56384fb2d8364320b75
font_02_sfnt_off00012f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F92 16404 bytes
SHA-256: b247925334b993573ef4596ef4b116a1f60633fe5a26bcae2c6cdb23f54cc6cb