Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7f69d17797fd77…

MALICIOUS

PDF

92.6 KB Created: 2021-09-08 06:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7340e6af7cfcbe85c0c5f3c8aaf6d785 SHA-1: 367074a217883d0637ed4c6b9406a0f5ff2178ef SHA-256: 4d7f69d17797fd77c94ad5d7584ba863909fb77829f59385bbc4761658a30a13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS upload locations and disposable hosting. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c26f1074b8---mupiwaj.pdf In PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/nopunojaxezi.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/1bcc757c9f2f4fd63a89b3a3139b0ac8/suwudejivafabadola.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/9904162923.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/lumonavepebegipomugomelak.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/75343940966.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/kajixifipuzotesagosisudu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1b29c0ae3596fa2fde6219951b531dea/28109635268.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/264c4c4a77e7e41df5bee9f2bd111c3d/xapebozozozisupeko.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/gatelazofutagarufumobeti.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/30753717688.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c804325957---92774298445.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/50430220691.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3467cc46af8ffc81947e84f2423e4ea8/98893131444.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118d8dd6fece---pexijorot.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3eb3f3313---45119506445.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/kagavo.pdfIn PDF document text
    • https://gilbertems.com/videos/file/88370459433.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/66423433476.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/zotetowiwoxiguzitan.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/98844568966.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/komaputumudoza.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/vipuwikoserojisowuk.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161138a25619fa---zuxeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=esercizi+su+must+e+have+to+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_off0001005e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11870 19532 bytes
SHA-256: 50221fa27e3560cd8b6342539ab39e7d002668f03ad53939099d579ac44bc81d
font_02_sfnt_off00014bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BAE 10944 bytes
SHA-256: 427c86a4ba98aa44c0d3de2b76e303126d4be0aa29cd77c8773af4acd550240d