Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19dc1b1e3225dd2…

MALICIOUS

PDF

73.5 KB Created: 2021-09-26 23:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8714dcc271a72a5c2e6b71982f91ba68 SHA-1: 4bf99fe42cd22b5a640d8a6bd2d74b94b29dffae SHA-256: e19dc1b1e3225dd21e21200694fcd879b4b443bff443f00ad3fcf9d0886d0413
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, and it contains a callback lure consistent with tech-support scams. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content or initiate fraudulent interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://techcessgroups.com/userfiles/file/1668779016.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130229bef6df---25186916812.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/fogaw.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/55164234084.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/tupeliletikuwasu.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/11548598866.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/palovetuwuj.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471ac22c421---57239504579.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161326ac090a0e---76103138961.pdfIn PDF document text
    • http://congtyvima.com/images/Download/38033726348.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/napuvopikudixujasi.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/59310428290.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3d0e0e956073f1719d5fe80c1c5832aa/patupujuna.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/dafepugekiwow.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/35393935712.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9f93c2171eb9273e0da6d9dd875e03b5/4088629868.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/romakiditifek.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/marewinamotasudomodus.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/pexugolejeginok.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/duwowelab.pdfIn PDF document text
    • http://ardennes.proximeo.com/ckfinder/userfiles/files/48318569760.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/genubiperavovewujabadasij.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/zufizexaxozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+recover+pdf+file+in+mobilePDF 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_off0000b8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DC 10736 bytes
SHA-256: 6932067f430be69da08712266bf0c27d4539ad1e55e44f53723703421f3d7bb8
font_01_sfnt_off0000d133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD133 17976 bytes
SHA-256: 7f63db5c5aeb73df7923c44f5ffbb02139a2c170fbb9015748fdb79d07031e6d
font_02_sfnt_off0000ffdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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