Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3ada13d9c32f12…

MALICIOUS

PDF

71.1 KB Created: 2021-09-20 01:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f05bdb263936fc13ef6f70622b9676a9 SHA-1: 18f962d94d1cc688a1dc4d65e52a7480157a4e89 SHA-256: 1a3ada13d9c32f12884a320ebd4d3d5594ace55a91d7e2be2aceade766de8566
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be part of a link farm hosted on potentially compromised or disposable domains. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be instructing the user to open a password-protected archive, a common tactic to bypass gateway security. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crysiq.ru/uplcv?utm_term=android+fragment+listview+detail+view PDF link annotation
    • http://etre-belle.su/images/file/5307651518.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/zulizegegin.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/16537254619.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dd7166f89---32874074625.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf57b01dd4---gunuludovekemidajemukivan.pdfIn PDF document text
    • http://bonezi.morefriendship.com/upload/files/13476764889.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131f5f42f925---pujakuxezolifenukozanix.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9f28ef0662b771e85a3000d9fa61a233/filegojulokejetulovaz.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/sajikesejekobomikoj.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/rawatuvipasifex.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/jadexafajewevuloturepegaw.pdfIn PDF document text
    • http://velisend.ru/photos/file/sosikugevedugase.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/jexolusufutozo.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/resupajavirafepo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde7144b16---24414182493.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/xobojised.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/33820518451.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/pekedewisinovumisopok.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/nifenegab.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/pebipaferajawajoxagono.pdfIn PDF document text
    • 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_off0000b398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB398 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAF 10832 bytes
SHA-256: 64084015665b7e26b77d1e96a8805c297703d9ca74f153c6a6c7b34b320478ed
font_02_sfnt_off0000e483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 16624 bytes
SHA-256: c1f9332ff22689e7ffbab32ef5fcfab49820838d3851e38d28c2cf698e92a24b

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