Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8bf3ed4e12737e4…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 10:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b113db52516891e61027a0188f8f8c8 SHA-1: b7f7db89af33a0fa0c714283492d31b027f152e3 SHA-256: a8bf3ed4e12737e4de07389951b710638ed5ea2172d1df9aef221f86f8021782
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous links to external websites, many hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and external links suggest the file is designed to exploit vulnerabilities or redirect users to phishing sites, likely serving as a first-stage downloader or part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://allytemp.ru/uplcv?utm_term=convert+android+to+webcam PDF link annotation
    • http://cristal-in.fr/userfiles/file/6635503762.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/gusunifemamelarosezeg.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/varevimejokogup.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1669384452.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/60957275288.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/67ead2773e250eece0b7bf1b480f1954/mejomejalimofarekimoseji.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/5791282094.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141767c9d107---43963553454.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/89975720496.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/fapadudemeraroninomani.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/97277599933.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613befc9775dd---336276090.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/51341307243.pdfIn PDF document text
    • https://successalpha.team/upload/files/61859388567.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/55659847040.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613f53e9e450c---niraposaguzenevulot.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/qs3se9gonlb7v4jubuh75l7lud/jawope.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/38606549089.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/xiserumevuzejimodaximo.pdfIn PDF document text
    • http://elitvorota.ru/f/file/95149009799.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/wozepizasimiwuxad.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/17437930903.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/devafifajarozofij.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/82530312276.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/legiwududi.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/venirapexisugewapeg.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_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 10640 bytes
SHA-256: 7edf10383898775e1532fbd0b1d01d5f367d3db8cdc63863a84ae56a93e5adce
font_02_sfnt_off0001116c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116C 18520 bytes
SHA-256: 8a1b239ac226cd149072e59183f2636fe7c6cf281e467277cb0b6e78905dd641

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