Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6c2bab7e891be0…

MALICIOUS

PDF

70.6 KB Created: 2021-10-03 13:47:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0156e09bab20ef58d4abf8d858193263 SHA-1: 3317dc02d789d80baf1619e89df9668495428ff1 SHA-256: 5f6c2bab7e891be05a7b5da3c3e5793015218833ab6c64a67a12fcae47aaf777
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content or redirecting users to malicious websites. Several heuristics indicate the presence of a link farm and compromised CMS uploads, suggesting the PDF is designed to lure users to external sites for phishing or malware downloads. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://catamma.ru/uplcv?utm_term=text+stroke+in+photoshop PDF link annotation
    • http://sotel-perm.ru/site/file/93660903292.pdfIn PDF document text
    • http://hajnysport.cz/FCK_userfiles/file/66776313572.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/nebowufimegibewav.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109232224599322.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/dafiwodavewifeku.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161473582a13fe---vosibosixujota.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ln2d84gci0gsa712aqf92bg6u6/59382485066.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/tuxixamubemuroza.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/nakupuniko.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/jezusifelinebujof.pdfIn PDF document text
    • http://soc-in.com/data/media/files/52639787729.pdfIn PDF document text
    • http://ahchala.com/img/file/wevisijaduxatexodatak.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/88376532895.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/mupivefuvux.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/zosebomuve.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/93442874026.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/melaguxamilevivagoniri.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/nirogi.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/69442984296.pdfIn PDF document text
    • http://youil.org/userData/board/file/21398726631.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/bepik.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/68881874072.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/72658066369.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f074567608---22299238565.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/sojigavowugegenawuteguser.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_off0000b48a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48A 16032 bytes
SHA-256: 5ec0a62e4cc180123743ad2ca27459af857c07fa0394c2979cd0af41631f7007
font_01_sfnt_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 10300 bytes
SHA-256: b6b7f815794d3ccf66dd4531fea694542760e8b54d5cf78c9976a7a259ce7c4f
font_02_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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