Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7ca344cb07d5a9…

MALICIOUS

PDF

88.6 KB Created: 2021-09-17 15:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f2fdc5599507589f2d0431ebfd4f709 SHA-1: 2404144fe17a945ba69901ea7df4330e1c19d7e4 SHA-256: 7c7ca344cb07d5a9132db8639b5e157d3823e7143fa002a93308794880e9753c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these link farms and the overall detection by security tools strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://perfecthospital.org/ckfinder/userfiles/files/janimidaduwifoxuzuja.pdf In PDF document text
    • http://wenxuezj.com/images/File/84175799099.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/27972642086.pdfIn PDF document text
    • http://maidichike.com/upload/files/86836011036.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/iqpfl0qnbt0odjbkel18sb8p6u/84891872475.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/vuxokanibamiv.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/xizalovoxibupaxogilavane.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/47291618227.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/26353843834.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/16734318150.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363b939d993---27324171189.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/ravukex.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/bqsa9s09bp1midbroajjo9dti4d6g25i/xebeletil.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/kajokitixigos.pdfIn PDF document text
    • http://erpos.sk/data/files/popafesunaxepirozuwir.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/negumeliginetebakupoxaniz.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/fixovamepoluw.pdfIn PDF document text
    • http://datxeninhbinh.com/data/dulieu/files/zujegesatib.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb8cdc6fa---95021875320.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/zilomunixifi.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/libibimenusuzeligeselik.pdfIn PDF document text
    • http://covina.crazyrockinsushi.com/uploads/files/lijaporivapukivigek.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137c1d14be02---65197233094.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140e61438d67---5457237495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=lord+of+the+rings+return+of+the+king+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 18572 bytes
SHA-256: c0b52d463592fc13458e9e7880aa9b123d00bed296d81d62d013ab1c14a31c59
font_01_sfnt_off000123da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DA 10716 bytes
SHA-256: 60ad6551ae698a9b4d9c7a47ade857be8f38585fe4c27963ca2a5d213497f8d3
font_02_sfnt_off00013c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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