Malicious PDF — malware analysis report

Static analysis result for SHA-256 accb1d19b834256f…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 09:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38aeb2df5111e787fc7c5c71418ed4ab SHA-1: 2c851e2dca040a2995be39803ea3195988cce8f6 SHA-256: accb1d19b834256f24e1dcb26a83b778f671932568d45f78e71885bdb06df13e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The presence of compromised CMS upload links suggests an attempt to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://walnutcreekguide.com/wysiwygfiles/file/zezolimobokob.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0a6aba815---zesozoxa.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161343af29b4e0---87397714765.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/nalidovaxukujabet.pdfIn PDF document text
    • https://people11people.gr/uploads/File/83765822206.pdfIn PDF document text
    • https://maisonforville.be/documents/file/pexaselup.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/jodopuzome.pdfIn PDF document text
    • https://lerivagedesmilleetangs.com/caningest/images/file/ralenurujafadobok.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/38306016906.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/zaxawifetekibafidu.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/33186820412.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/64217951784.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/nokusiforiroti.pdfIn PDF document text
    • http://citra.cl/userfiles/file/67215656010.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/77727627546.pdfIn PDF document text
    • https://mytopics.it/uploads/file/jogelabonigazanegopa.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0f99dhbv458tnspinc2vrauje6/vezokunejiferarekelef.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/tetexuvifitopanuvujob.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/4ki7g45cj03ens0n8870kaqb7f/kawamawaxububararefa.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/67001169113.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/c7eju7u0kkv9s01topp522ljbh/fupazejawevegere.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/wafonapirufejineralekejo.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/pokigiwaxakiko.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/9631203857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+blacklist+a+number+on+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_off0000b68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB68B 10940 bytes
SHA-256: 596f90d1de00acf9245cb792f73bc93a2dd5f10d0d8430c4778442bf71676c69
font_01_sfnt_off0000cfeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 16464 bytes
SHA-256: b594288be6fd1045c46e3d1e337409e2822e4414eb3322a3d1cf5e3e29118fc0

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