Malicious PDF — malware analysis report

Static analysis result for SHA-256 967e52ff9faecc9d…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 19:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30ef2de488da40b942996297dc6a8aea SHA-1: d7442b271fc3e2ac903f1c40894165ad3f861661 SHA-256: 967e52ff9faecc9d0a6dd237cc670a952f5257ba90bfbf22d81dbfc78e4f7a02
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, suggesting a link farm designed to host and distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://nuklearmedizin-amro.de/userfiles/file/ketemoratasapivixa.pdf In PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/dsqlif0834rv163783hc9d1ftg/dimoleloxoxeresarawelib.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/21466466617.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/83960277323.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1624a04a2---koparebogiro.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dbe7a1f23---74606024134.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/26245564835.pdfIn PDF document text
    • http://axwelindia.com/uploads/pakakoxituropedif.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f080895754---42489682075.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/52fds288uo0e4u7b526tqh6ckf/gemelajuvojolosimokigap.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/q0loqerkg67uk2mrd81erk4fp2/wudag.pdfIn PDF document text
    • http://kasargod.net/uploads/file/65187348095.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/06b9a873fc27c7ce9a84afaf057cd67e/86316213074.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/88771156705.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/6469676725.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c22bcb6001d43f47eb38c18c55b2e41c/26015360996.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/26458526723.pdfIn PDF document text
    • http://elskenecologie.nl/files/27966664956.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/14743311694.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd2b7a7614---55362503466.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/negexowazilofik.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/motedupake.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/a85fcd5612d16ce38da3bbe44287a53b/vosadarotulupirasirogok.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/mowisujadejopiwos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=medical+english+pdf+downloadPDF 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_off0000c504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC504 20152 bytes
SHA-256: db5770d903e824d32353fe8ed1c435da70686b5f4ac5004aa45de070a201e4da
font_01_sfnt_off0000fa01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA01 10780 bytes
SHA-256: 043f7bb1727c862ba7e9a5669e305117be3824577f298ed78e53e0f98d6ec11d
font_02_sfnt_off0001128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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