Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c01121c020dd665…

MALICIOUS

PDF

104.7 KB Created: 2021-09-17 00:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fa1d2a5047c77123db5cd08a4d8efd92 SHA-1: b2c52587d1ab3b5b340c777411d69c655358c79f SHA-256: 1c01121c020dd665e1691eeb9d5311bfd7b496a61c4aa8e25075a2530f15e6c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://huntic.ru/uplcv?utm_term=1984+george+orwell+book+pdf PDF link annotation
    • http://sacmacbook.net/userfiles/file/duwudirexakijabuporovo.pdfIn PDF document text
    • http://cartopack.be/Images/file/77806668068.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/nodobeneroma.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/54844047666.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/cbe956a6da2e3c5182c8efff6583fc21/31662214412.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/jewugevi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5dauap5cjticahu7pu7rfkldcf/wuwiwamifivemikedinufusiw.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426b5f2cc88---poduxulutodezoriwifezi.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/lixumopikapofafij.pdfIn PDF document text
    • http://ukrfirework.com/images/file/vusakoxasavop.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/riwinukanizog.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/nuxupafigekirinazanosove.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/kesulexafabiretuzunegize.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/86889653871.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/99628066168.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/ravudoxizeb.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/kijigepupoli.pdfIn PDF document text
    • https://biodez.lt/i/File/6403594412.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/sopitugawovamep.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/21600453381.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135d95eeaa90---jowutidufabojaxikataji.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/33631674129.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/46891324855.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_off00013344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13344 18900 bytes
SHA-256: 212f5db0ec863dff423ef8628a01f5aa4161310ccb9f7d93f5bd0f351f5861a5
font_01_sfnt_off00016429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16429 10776 bytes
SHA-256: 13b6864eaba22451c32ed54d8f53fff83dde7e7afb4337d9d3f5a43e1c3ec025
font_02_sfnt_off00017cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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