Malicious PDF — malware analysis report

Static analysis result for SHA-256 330c1894235b648f…

MALICIOUS

PDF

76.2 KB Created: 2021-10-08 13:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1307b31d650008d8c53f6987da29a50 SHA-1: b80d36171047425d686291b9a6241dd3ba72c892 SHA-256: 330c1894235b648fceaa77c44327e44af220102285d9c9660f78152550a8ad63
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm designed to obscure the true destination. The presence of these links suggests an intent to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 6

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://krisoc.ru/uplcv?utm_term=tooth+extraction+nhs PDF link annotation
    • http://itagqatar.zajeltel.com/itag/file/files/mubowadobimumadane.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/78954956421.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/10952254595.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/nokadagaxeruvol.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16139468784123---rexotewikedewuj.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/19b661482ced45f39e6c3eb8d6c3f2b0/28359086239.pdfIn PDF document text
    • http://lejonhund.com/upload/riribumezevubofa.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16156472f87461---jelubabojuba.pdfIn PDF document text
    • http://afslab.asia/upload/files/35115149538.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/mivebosasikarovajoxeb.pdfIn PDF document text
    • http://mayjack.com/upload/files/42689482388.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/26870217885.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/48477791194.pdfIn PDF document text
    • http://puisan.ru/uploads/file/64685269532.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/pajozopuweleganep.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/43533122296.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/9124560278.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/39596342354.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/60122473853.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/fobotejevawagofasu.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/zijazekonefovokubakaxobu.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/bivivomemadakujozox.pdfIn PDF document text
    • https://unosms.us/userfiles/file/94420778131.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_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 18512 bytes
SHA-256: d6c57bd37be707fd5ed4f87815a3ff5a7ba118bf79bbb203cc0a95d6d2030060
font_01_sfnt_off000113ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113ED 10348 bytes
SHA-256: e5af9aa6a98c73664c20751fcea0f1672286a839760da08405dcdbbb9879c366

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