Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0a3020d9acfc9f6…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 21:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 033cd008612eb55a08b04f344c73bb1b SHA-1: 7fed85c446ec3e1d615a5f4c361e2a03dc7fd827 SHA-256: a0a3020d9acfc9f6646e455d05e0cf3cffd15c32fe5ad9cee35359056f995586
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://medtek.vn/storage/file/1072477916.pdf In PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/xuduganulalolujala.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd999b47cb---maxesavitum.pdfIn PDF document text
    • https://birotex.rs/images/files/fesaxepedi.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/22287235014.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610abb44eea50---55376572942.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021082206032773499.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078a629c7a37---80264366017.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/korusijowibivoduxot.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/4da82b35338c6769b47e4b43d22512ce/52704286667.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/40152523803.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/xevufedegixupejipekasozeg.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/5aide6anvmibjg5i9usrmm7amk/97515322949.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/9598934749.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/ninovol.pdfIn PDF document text
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pomawetodalajopekaw.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc8866472---bajulitewulilowezek.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/24044030483.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/vuxuwof.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611359f34d105---8366533150.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/banifoniwaxivibovapamefa.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/94904574278.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/24711621371.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/64857030906.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b40a9f37709---vuvufose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=godfather+theme+piano+sheet+music+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_off0000d277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD277 10980 bytes
SHA-256: 34b334b1a1e847fb2eb07bfaabaaf88a47129632766778278141cccce3e19f2b
font_01_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 16688 bytes
SHA-256: c7f8b453996de1d6a48c1bc0687248e78c6c89d4ba7c0b64a4244e99f7db50f9
font_02_sfnt_off00011679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1