Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d5d11c9ac8f7a8…

MALICIOUS

PDF

86.6 KB Created: 2021-09-13 18:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ffc6bc7e746d8524e79a1684aacdc591 SHA-1: 5d564c672b8af558577066735ae729cbc2d3a4a1 SHA-256: 58d5d11c9ac8f7a821323476b6428f4ff3756552074452e0736c454e281afa44
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to potentially compromised or disposable hosting further suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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.
  • 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://muratay.nl/userfiles/file/6831162683.pdf In PDF document text
    • https://clubkdo.fr/img/pics/files/2081985072.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613424fe915e0---76704751549.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/86310246969.pdfIn PDF document text
    • http://dhf-china.com/d/files/73638988639.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/satudafigawewuxa.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/44617570127.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/gugafofuj.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17053478004.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/fesunopudunogo.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/93969296931.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/nelubofuxixixapadasive.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4fc80a2b1---maruk.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/41745752272.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/robikomexe.pdfIn PDF document text
    • https://hiroyoung.com/data/files/96599159101.pdfIn PDF document text
    • http://www.bash.cl/media/file/90339617495.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133e4b14c4dc---68063640246.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/jozasulanid.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/36634042179.pdfIn PDF document text
    • http://greenvisioninternational.gm/userfiles/file/68604435594.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/85468573988.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/66553325203.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/dusixe.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/xomufukeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lake+coloring+app+for+androidPDF 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_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 10580 bytes
SHA-256: 3415c40898bd5609225f66b062f1bd414e1a32c43e165e2f1d6299700c407ee4
font_01_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 17548 bytes
SHA-256: d946fd903efcc756c3cb43d6ad6c1cd86b06ad240ac7351e4250c890e8370c55
font_02_sfnt_off00013499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1