Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1b23316ee41559…

MALICIOUS

PDF

87.3 KB Created: 2021-09-03 17:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0f4ca0ff245fb47b8ad2f5ba12e98059 SHA-1: 94bee77e4b8549cf72cf8688e539fab4e6f4fc27 SHA-256: 3a1b23316ee415592db6671e6609c8033f29b940ad10cae32f3955c4b2c94dac
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 or disposable hosting domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://omgmediatank.com/userfiles/files/sefepurimotiz.pdf In PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c326c956b---49981114750.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/10495655021.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/rufamajivifeta.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16111b2ccdfd75---zapotemurane.pdfIn PDF document text
    • https://go2germany.ru/files/file/64810750676.pdfIn PDF document text
    • http://ukuleleceilidh.ca/clients/860383/File/pejekekovadanidura.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/noxopi.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/70345882223.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/xabedurodikipuzexow.pdfIn PDF document text
    • http://xsteelstock.com/d/files/suropemovila.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69e65d6236---peborobudek.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/naxakodimokusukuxefex.pdfIn PDF document text
    • https://theurbanthinktank.com/files/taxilexejuvejinuwubu.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/40800265740.pdfIn PDF document text
    • http://shophouse.info/images/files/3443401050.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/6b963ce1bec398b1e596ee68f71a6f80/zoluzutabivovizole.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/57793634778.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/juzurufoletumif.pdfIn PDF document text
    • https://blokhol.com/upload/files/68032120893.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/danamubudot.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/47494460624.pdfIn PDF document text
    • http://ridendo.cz/files/file/meximewetapeto.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096700d4c20b---14480496328.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856c5f280ac---49858600814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=citomegalovirus+na+gesta%C3%A7%C3%A3o+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_off0000e5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 11500 bytes
SHA-256: 436ed647ba1d4265655fd17da1671c5aa0610a0384d07bbeaad217f15433dee1
font_01_sfnt_off0001008f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008F 21300 bytes
SHA-256: 068115fdebcabd84df14caa9f5508ae9d4950bc1b79f52f0633b19bcab4455f8
font_02_sfnt_off0001357c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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