Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81c7747e27dbb9a…

MALICIOUS

PDF

72.6 KB Created: 2021-09-07 19:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22ab92e4e5b6decd9bf99a13e3f3f449 SHA-1: 29746748dad0f53c041aff423366c6d0503c903b SHA-256: f81c7747e27dbb9a3a0813bc2197955bafa512b6446a97a2be7d62ba2b22aa5c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/696b5b91b122692713de66aeb74a299d/wijutonixomesuwid.pdf In PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/ck63lspqo02rp86rjo5fteanq5/2705588667.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/3n3rhg2ueq2khe9565tmqnj34h/vuvenazumufewizadomedag.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/midarixusuraxopisinejo.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/97951718397.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/59560203397.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/luzopaf.pdfIn PDF document text
    • http://net-marketing.hu/images/files/minap.pdfIn PDF document text
    • http://parentini.it/userfiles/files/rixigoxapirifotovonago.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/deeeod7kk9pbbfhj0akbvm56pr/47010393310.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/97912642825.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/4643782979.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///17225703535.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/pafipalobalapesovoki.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ptettn2bb7fsrvne4si3isc0bb/58632937417.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/1cfd6c977fcac89f794dfce4e832fccd/nikurukemaxa.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/raxogasikaluxozege.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607228e924b82---gegezazipumemupa.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c43a5114a0f---laxefisemipovi.pdfIn PDF document text
    • https://groupburuemas2.com/contents//files/rabudiguxipomu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/17cljlq6tvr52lgch8e93bm4n3/sovadatobijino.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e3c1c23b---rujakutojesub.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/jexazuxefarefiwikok.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/kabajisarotulatetuxa.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/2fdf990e718fe718ff02997073f9361e/61997294513.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mpesa+paybill+charges+2018+pdfPDF 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_off0000b92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB92B 16036 bytes
SHA-256: 8a28ca565f6485325d419ac9b4b3fe629dfcba8e477f7f7644e7f46d66458c1c
font_01_sfnt_off0000e20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 11324 bytes
SHA-256: 7387a2dd67f16c233ba276dfc21728bd9d08bf70593c280a7b2453c6186409fb

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