Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15fe3057fc77d3a…

MALICIOUS

PDF

87.0 KB Created: 2021-08-16 00:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 04632b6aab6de003b9090929ddd96dba SHA-1: a635296fc1ec78b588260083acea9a86539f5465 SHA-256: c15fe3057fc77d3a32ff039a9e294bbb935ce29359f5aa2d0a4df244984e739e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple external URIs and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609260dc3d7ab---83176775064.pdf In PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/6159740500.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/rifovadexagilakaxul.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/341b9541d34971d442c466ea81b638cb/buweniwopaguwixafakewu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd6cb5e961---xaguwowuzidowotu.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/18040003080.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/wuvukewoxirolulob.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/pemufitotibifidobo.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/6777738650.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4dcd5a48b---navotulovuzabelugudob.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/33154082759.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/buvapozew.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf0fb6385d---74560910097.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/3464545256.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/44956087650.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f55e2b53a2b56ea9565a539a9b87df87/57683856063.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba1c73c487---38475146494.pdfIn PDF document text
    • https://cargobull.cz/res/file/zavolejizoboxeliduxupun.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/51467062614.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/c3903960fbf6d5558a28198d43d9eb7e/53477780424.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c492c425446---41077090958.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610c5d3607a74---bebolajibewizabip.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/16982969365.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c43f30f493c4edc5eaf66f7de811ed1e/74094952173.pdfIn PDF document text
    • http://paynechapelduquesne.org/clients/9/9b/9b910c66cef3ae2d1bb1fd5804160a19/File/jizegadar.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/xuzilujevuwixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=3+day+potty+training+boot+campPDF 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_off0000ef7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 10840 bytes
SHA-256: 283c0ba3b6f1a9234651891e3ca3854719815b92289966f1babc2bb6238c84f9
font_02_sfnt_off0001201c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201C 17536 bytes
SHA-256: 9cd48d7ba50c61d97e74d33910a2b7678d37e58162562fc9405710a5422a61e6