Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbb2d0028a24645…

MALICIOUS

PDF

85.6 KB Created: 2021-09-03 13:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d1d2df01d605c55e0a594c7e933f2cf SHA-1: bc87c9f498f1182832793e53d6232a9fb8b9fa76 SHA-256: 3cbb2d0028a246452000f071eaeffe5cf0234c83888c5e6afdc47581e9551d58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites and disposable hosting. The 'SE_INVOICE_LURE' heuristic suggests a phishing pretext. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cephedanismani.com/images/pages/file/1354537531.pdf In PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160add2ccb5017---18817510936.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/nusisizipiwevudizev.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c33346ac38---fojolenowexewov.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/12420591386.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/vajotiz.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/66292566754.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/10671475545.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/82715084370.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607145bf300a9---jafikiziwone.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/rawabijeg.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/warafukoteja.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210811_787D59282F77F3F0.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/bevowarajerejat.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/40d475b6a8b6283b40907a2b7d79c6ee/giwejoza.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e53f425c422d740bf5968841d8d848f/15745961824.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161043d5f4cd65---sipevivodelimemaputeno.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/61851638554.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/28046508379.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/67750655929.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/tuwegesasepiwero.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/9266208602.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/61jk4dqrv89bjn0r574c8ebf53/59670439317.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/550648b13c7759eccdf6aa3d9ddb0a68/jejesimesabizuzuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=citomegalovirus+transmiss%C3%A3o+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_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 11304 bytes
SHA-256: bccc405db9bc9f1d1f22695e68f77635f2d0b23877bb562761b6b3b80cc3e46f
font_01_sfnt_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 18368 bytes
SHA-256: a310fa1575378d062427c866f4840b06f3604117e4a04459494df5a98c04b58d
font_02_sfnt_off00012e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1