Malicious PDF — malware analysis report

Static analysis result for SHA-256 f239589b1b6adc8a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 00:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d51c723e91be8c13f4d9c0c2e3c9c9b2 SHA-1: 9955b70b757537688958237cd6a64f89c6afe09f SHA-256: f239589b1b6adc8a2e1f99ede1dae04aacdef54951374359ac3238da62361e27
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a high number of external links, many of which point to compromised CMS uploads and disposable hosting. These links likely serve as a lure to download a second-stage payload, such as the PDF referenced in the 'carraracucinecomponibilitrapani.it' URL, which is a common tactic for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://laborke.ru/uplcv?utm_term=bully+mod+apk+download PDF link annotation
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d933c5fd27---11011787082.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/47567722258.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/fasepomibufabimizuke.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/wolixulerukoz.pdfIn PDF document text
    • https://thietbigas.net/media/files/15561832226.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/gerajofidebakomeno.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/86305581820.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/68040911212.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/78712321159.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/52685105.pdfIn PDF document text
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/ruvuvafadi.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/953569913.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/rawisipidelewu.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/tonapezovorokomuporilun.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161455101e2c60---dizorupamoguvelumaduda.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/zatamobigulub.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/17324346298.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/lanalufekuw.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/fimoralovo.pdfIn PDF document text
    • https://fishuntpesca.it/file/16406978893.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/13562480395.pdfIn PDF document text
    • http://blccy.com/userfiles/files/72642544078.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/86641997509.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16144a02819819---54759416926.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_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 10408 bytes
SHA-256: 03456bd12213f697d6983c44c014f82a0382aa7a99e35313a5d1753d278bb6cd
font_01_sfnt_off0000f0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C3 17904 bytes
SHA-256: b96ce9b7227f582e9f8582d94e8e546c25e860480147a284b761045ce9f4180b

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