Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d3c47b774bce22…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 23:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a73fc525375eae9488965712fac4a6b SHA-1: 5854f01ed2c2437e10e756e9d58671e893939dfd SHA-256: d6d3c47b774bce2225f6b74dde554d34fcc1ac6d40323de359bc46bc813790ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, embedding numerous URLs that likely lead to further malicious content or phishing pages, disguised as a training manual. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests a deliberate effort to host malicious content on compromised or disposable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 https://queure.ru/uplcv?utm_term=amadeus+basic+training+manual+english PDF link annotation
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/fajiluraforewajajavexaso.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/cv3akc13f679ephdj3n2rg329g/gibukurogeja.pdfIn PDF document text
    • https://badoza.net/userfiles/file/8672943124.pdfIn PDF document text
    • https://nexusmediation.nl/files/dinisas.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/4930175941.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/10aea01803f240e9c3cb7a5522805965/93742857916.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161076f68c82c3---nijezovolopolipanij.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/tepewitimosovavusavakufu.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/edc24a0068f094200c8a37c00763fb54/rupiwakajuvezaguzeguxexe.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/93456734020.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/97005968679.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/ruzelazekedavis.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f4b978d4461---12383198237.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/74744089540.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/naxodero.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/kipatatofabalanepogiwagas.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/10545603368.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kejuruva.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/20649460567.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/lozevafumufag.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_off0000cb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB04 10920 bytes
SHA-256: 0186e5988eb05036b330cdf6bb9383de6dc2d1ad9012022ecd5a519e1085936c
font_01_sfnt_off0000e3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DA 17952 bytes
SHA-256: 36f4242a813bbcdb8001d68aa82344f6f18ca59742371dbf3f2eeed1837f2b70
font_02_sfnt_off000112ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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