Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6538d7d20d5b108…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 11:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8f3760fd0e3a6d98dbc303796e3fc10 SHA-1: 81c90e6f07874af251ac6873b220fe19cdd05f2f SHA-256: f6538d7d20d5b108b7dc0706b59fe74496e7a47ce9f0ff5a9713f855f9372897
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98c51e2f1---tidigejoruselu.pdf In PDF document text
    • http://vitanova-cattery.com/upload/file/nakewaxoneluvixonixa.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cac1c2fa6b---57964855089.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/42958109199.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/30490211321.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/83285511174.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/94423514761.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/dexopi.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/80526858572.pdfIn PDF document text
    • https://drjou-vc.com/upload/files/lanuxixutibis.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210909_21F96C546EFD4EC0.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/42174064342.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/re60otacgm15pgcbqhk9irvdq4/regexatutudakul.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/tokuwatazele.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/sanovodarabi.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/palug.pdfIn PDF document text
    • http://orzo.cz/uploaded/files/17665860270.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/fokidafubaruma.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/21316599441.pdfIn PDF document text
    • http://midel.me/userfiles/file/85633330165.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396ab347a01---74934932770.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8c6aba38---dijivilobomeses.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/tuwigadafogonod.pdfIn PDF document text
    • http://labellebeaute.com.hk/ckfinder/userfiles/files/41101354927.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=top+5+smartphone+brand+2021PDF 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_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6C 17568 bytes
SHA-256: 3fff4d7c5e1845edfe8b873422f9361b8f5216e425d850883a264dec5b2e8e0b
font_02_sfnt_off000117d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D8 11048 bytes
SHA-256: 28274e1619911efd6513b60222a6c8454af38140d27e02d78d18914fd1a9bbc9

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