Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfaec662da22c168…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 06:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f2d788a809107cdb2ecd9d8ae98e1939 SHA-1: 01d2db9ecffafe6210323aeb5099a57ec4f5b88d SHA-256: cfaec662da22c168695bb0ee7f9aa71b827c95f63b8a0ab0646d1af87041572f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML_NYX_PDF_MALICIOUS and CLAMAV_DETECTION heuristics strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://garglob.ru/uplcv?utm_term=catholic+mix+songs+mp3+download PDF link annotation
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091339c8384e---31462756105.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/5rm2aet5vcac0oqsvhoduh5l14/91583224291.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bba14aca3---delubanitilo.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/72155772882.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/39011247504.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/56509772301.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16077dc2e1333a---81244311684.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6b69f8d391e4b9d6d1eb2061b91c9ac2/wuvimezemupinuwogudotob.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/83710820491.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/26918238256.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/vaminolomari.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47c0628751---93063182208.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/92173336490.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/negujele.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/lojamose.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d4cac7627d---tubugotumawigagizen.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/3r43gqe91iort2bqrar6nak3c7/tejeterojomaxexed.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/20208690105.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/82ae7fab6da7efdd7f9c42c222ab3f95/12110901909.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/golegogijemubuwenunopu.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/72311124038.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/trs5sghrea45hb6k7b55vqt3nt/vitimiwadabujisuxime.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_off0000c521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC521 11120 bytes
SHA-256: 630612190aa20eabd28e3d3fa3d372dc660a96085131f1f0240d13bb750c6fd2
font_01_sfnt_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E3 20156 bytes
SHA-256: 975bd6a16666e5cdb8b7840d2c99681aace01fcac0bc0aae72bf2d5a4f20bd5c

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