Malicious PDF — malware analysis report

Static analysis result for SHA-256 a286dc82bcfb7b3a…

MALICIOUS

PDF

89.4 KB Created: 2021-08-06 21:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99e1129d2f8d8e0735c3e33bfec4241b SHA-1: bd64b1901b00175e95e12d6ffe2084b8ac237446 SHA-256: a286dc82bcfb7b3af0cdd0bea81440aac6410b1e37c549ae7d13675b5d229187
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://geometrarontani.it/userfiles/files/dexoxapabajo.pdf In PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/daf3bda5ab77c0350c0ea8fa190a0057/jeduliviperaxok.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/kobujedabemid.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/jezaleduneje.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/tl5gq79c7acbj0m1llud2dnnh6/lizadebipozuzininewav.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/mixunijeza.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/danubotapepokapomes.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/73869736770.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb0008f1fc---56442554895.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/bogomezuki.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/51563448852.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/ef5361e88f96272cca4fce3000fe4c7d/5391605432.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/pobefusutox.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/xolexatuxedezatipi.pdfIn PDF document text
    • https://hsse.cl/files/popirawugelitof.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/78965577254.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/5pluoj5g5qee5vm4dtda4a0730/xenaritevote.pdfIn PDF document text
    • http://synergyproperty.com/images/files/vawaneverazomokuw.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc31c391b54---zezefokubojidewepove.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ab20ab9779d---17325857029.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9f5f9abcc3a2f869e6995d96c37f714b/64828853365.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210630052359210.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210625050633.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608054f841ee5---74164870273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=rap+instrumentals+free+download+mp3+9jaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF493 11360 bytes
SHA-256: 857edcef435c4506333e7c20c007eae05726f54fe0947baf5b48edf2d97f256d
font_02_sfnt_off00010f5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5E 18252 bytes
SHA-256: c1c82d94486772830288d4ee4f10456810ccf88600900d40c88e1efe021add66
font_03_sfnt_off00013fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA4 16420 bytes
SHA-256: 7df728aae34cd872e86b8939eae83b1faa5e4f35adee4679d1ee9af7403bad18