Malicious PDF — malware analysis report

Static analysis result for SHA-256 613da667d1b93cc7…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 20:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 84f70ee14806e235a0287267a4e9c2a4 SHA-1: 943ff2ec03e565707934b5ae41e6b9ab86dfe07a SHA-256: 613da667d1b93cc7a9d42dac55e55cac06885660b64bd0458c1ed7ca65a8cf90
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to potentially compromised websites hosting other PDFs. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/60398145595.pdf In PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/jokotovekarefagutapomev.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/52075946303.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130b1d064776---31762688005.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/nolemu.pdfIn PDF document text
    • http://videlec.be/ressource/file/vujevuno.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2a5c140a---nikofinaxiwex.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/wezet.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4g9p94l1nhq9sd3mg8fcooav0q/xemere.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c85191fad---90359986248.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/wuzodozejuf.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/46177336003.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/5495396009.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/63010583131.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/sepizalufulajod.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/wisofofinupuvusazekud.pdfIn PDF document text
    • https://profesa.net/userFilesfile/1464463703.pdfIn PDF document text
    • https://sambelteri.com/contents/files/rasimejupop.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/965947999.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/43750528759.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/5387185462.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/21582481561.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/wodufesosogafaxowonuwe.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/49532894823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=think+on+these+things+krishnamurti+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_off0000cb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2D 17464 bytes
SHA-256: 03f5459442b800508340559b7e72fa9afbcadfe68de088a49af768fd2acdce68
font_01_sfnt_off0000f848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001105f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1105F 11052 bytes
SHA-256: c158addb09e68e5c59876006cf381c866c586c5367662d55d19a0099b4c6ea5b