Malicious PDF — malware analysis report

Static analysis result for SHA-256 31845a26ad04a070…

MALICIOUS

PDF

88.1 KB Created: 2021-09-06 15:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c488c49167b3c04aad05750dc7c1bea8 SHA-1: 28fcdfa9d01522693c1fea1d865e52843a019748 SHA-256: 31845a26ad04a070a3a88e3ec8df6190cf018e55ff8989b73534b99bfb0afa80
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 WordPress upload directories and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/f9puc3u2lvoelqo20099hc7nk6/20177201762.pdf In PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afda1fbb131---zapirakikowufafaru.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c641114975---78818867027.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/xarajurolapot.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16072dafcab80f---dunifa.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/14270449198.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110ca4ecdd16---letupev.pdfIn PDF document text
    • http://aroma--style.net/files/files/zolikumemerefoxupuxorexot.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/17468463652.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/69602795636.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/69726756235.pdfIn PDF document text
    • http://grotech.in/userfiles/file/fanejewiwu.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ch7p8b35vfoqg20o3td7ga2p1i/zafezob.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/gusotegupunomarexaluvi.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/44275177152.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/49585399941.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/66885377390.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160703118b414d---70420188829.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/rinim.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e5207a268bd801296aa483b346058e44/46473374434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=august%27s+consultations+in+feline+internal+medicine+volume+7+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_off0000eecc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECC 11196 bytes
SHA-256: 1ca8f8ceaa342c246ba2c2d7d676a5f9c2a93926842a28c76ad2e3b73a144495
font_01_sfnt_off000108f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12105 18760 bytes
SHA-256: 8b2cbdba4e8c700c873da7d4c6ed0ddfbbd7475945e1b4ffae9041de696f816e

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