Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ca272192f7423a…

MALICIOUS

PDF

101.0 KB Created: 2021-06-28 22:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ad77e2c0dcda4b7ae3732cf6fc24053e SHA-1: fb1c371514742ea48957ee3e2e642f8bf73838a9 SHA-256: 14ca272192f7423af6a805df25d2daebe57311cab1ff77566ab89f336a920d24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=anaphylactoid+reaction+example PDF link annotation
    • https://royal-art.pl/uploads/userfiles/files/fuwunuxe.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/pepixixovotulagevepire.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/nepiwevebosalenugak.pdfIn PDF document text
    • http://fitviewer.biz/files/file/37119340990.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609070424fbe4---xirulek.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ef3a9b916---48930524198.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/3f1f5d7362dbe288125b48ae5a98209f/90234945796.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/5754fc5dfc52ea2caf3ce214037a40db/2448524694.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/37994061171.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/nodanevezefenavibezeruwo.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/75aae1a63233e9ec1b1ca199df371712/44255283891.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/49773566590.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a18519b01fe---22197305169.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00e54a3922---bojikeroneg.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/pexorexuwuwu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160749fbe4dbb3---gunuxugel.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/i0ee2hfm08ehtpii0vt0sfgt96/towaguxozupasejivetasu.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/55539059414.pdfIn PDF document text
    • http://championshipsportsrings.com/clients/23492/File/xijitifatoxomewazawisa.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ac689c3a213---65262879851.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210609_090F3F94535729FE.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1f8b7e8c2a1dabe57f838eca22a7e67b/liwudimugakex.pdfIn PDF document text
    • http://cga82.com/admin/File/pefefusivileradelufasipem.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_off000122a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A8 10808 bytes
SHA-256: 7596e543adde9d5e7674d29309d0c7be55d211ee2b193fbcafad15367e337d33
font_01_sfnt_off00013b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6A 19656 bytes
SHA-256: 3186b456f96ce12bdd7714a5b66005ebf82b539242f7048040b69b4f170ce24a
font_02_sfnt_off00016eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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