Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d72567bf821798…

MALICIOUS

PDF

80.6 KB Created: 2021-09-04 16:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d5c921c91b12e95328fce377a840ac29 SHA-1: 1ebade0b575317c15424550e3b488df7a385456f SHA-256: f7d72567bf821798d8e99135d1abea1ff3822daaaa9dfde45b92c991c310d1fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://elitk.ru/_files/pivarifovivur.pdf In PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/zasarawuwewogudikoxib.pdfIn PDF document text
    • http://guowangcable.com/d/files/maziroliril.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/paxiju.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/83966937836.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/sinujabojoxig.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/51317956699.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077b0050b062---9044263058.pdfIn PDF document text
    • http://kelvista.lt/images/files/96611953463.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210531161558164.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/27606193204.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/43303911310.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97401f0a6---kabigore.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/mezix.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/botovagetizepobu.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/korufarurevosoper.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/fowefalibosumagotipeso.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/t4af41eopcr9a6c0810221ia1m/67615263987.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/23604225343.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/xomur.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f0f4e38781b6f3d5c2cc772f2485683d/fafodolelazozati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mcculloch+438+chainsaw+manualPDF 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_off0000d670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD670 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE87 10800 bytes
SHA-256: 83401ceb2fb5263f5c1f03cb88646a58483e1ec43abfb1893ff924eb29f94335
font_02_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 17496 bytes
SHA-256: fe509855fd18e31b4f57f9a5752f30c94ef0bfbfa9e55063b4cc97072e017742