Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc256e17bbc1538…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 14:57:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a289135b959f5a5bcb0211275004d55a SHA-1: 1b144929fdc1e9e313f7e4513288f44ee66b1a69 SHA-256: 1dc256e17bbc1538d9a17cffe4413072992b39fd2a878410e0533a91d1773c37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://volkshilfe-ktn.at/images/content/files/rotoxiri.pdf In PDF document text
    • https://gsacademy.ge/uploads/files/raxuvaratax.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd2cda44a2---96122299942.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guzedotuwugabeb.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/fegijuxetoxifuti.pdfIn PDF document text
    • https://swiz.eu/files/editor/69266907514.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/52326575776.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109112256166990.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c3d8ba1bf73a8bcc1e7b1c282517ff13/20888649857.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/favejezoki.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/31515446391.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/20789599713.pdfIn PDF document text
    • http://cmtl.in/uploads/userfiles/file/file/30664104206.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/92393518549.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/zoritilirofulibulevot.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/dubimupizimaguzuze.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/jedojikefamenok.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c385922ced---misokumelava.pdfIn PDF document text
    • http://zjgyuanhong.com/v15/Upload/file/20219121654219751.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/84168333910.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/72528772265.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/putesoweziluxup.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/9121690659.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/68333175661.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/moxeba.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613688466963e---damapogezakonukez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+art+of+shaolin+kung+fu+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_off0000d9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C1 10932 bytes
SHA-256: a3168af4c0fe26423bfcd89baaa179818daea473026f91860a537695d25e9bd1
font_01_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 18720 bytes
SHA-256: 2e871fc04de3f629445a51a3ce89f56f09d9f570e1b2778e3445c26efe759b39
font_02_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1