Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c376c1c7a82e833…

MALICIOUS

PDF

78.1 KB Created: 2021-09-08 08:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f8f412b15a38e36fee1ab04fbc63b603 SHA-1: c6e6faaf090b7de488df543948b07ede54058276 SHA-256: 8c376c1c7a82e83387465471d822f6ba676bc1a3fd2e629b31fbc9737831eb1c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. ClamAV detected this file as 'Pdf.Phishing.Trojan', indicating a malicious intent. The presence of these links suggests the document is designed to lure users to malicious websites, likely for phishing or to download further malware, aligning with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3586

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://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608323d14f2e0---vaninegipekazinobaxala.pdf In PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6610679d35---mujodomuruxira.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/12091986574.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/62645561436.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/komaxegamitixojonaxajuf.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/sefene.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef22a63184---bijoluseroziparabakuni.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/panigu.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/rjqvndh84oq46pvh1k6b4frvt1/2270268166.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/zawodibewelofatozelorit.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/jakuto.pdfIn PDF document text
    • http://hondaototananlongan.com/upload/files/tobitoxodinunapebopimozuz.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/sevivaradawemexozowedinis.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/85141940659.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/xulanepejewefebetu.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/41371982791.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/7456240941.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73a6ba09e---tenopamajubamewulaz.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/fiduzivet.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161182d1c41607---10006312955.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8407e05456---xavepufe.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612a6fb49d9b9---62939106205.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kelinatosefoxinelosonu.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/1609e29285b1c21eca28d5bfea8face8/kizefoselovubofapopi.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/xijogapologadorukedaraf.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/pazawezepa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=diplomacy+book+by+henry+kissinger+pdfPDF link annotation
    • 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_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 17484 bytes
SHA-256: 88808d3f2a2b11eb43821a203226132fd4e95fff5587f1b70f8e80cc85937dc4
font_01_sfnt_off0001150b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1