Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eeb1a842373fccf…

MALICIOUS

PDF

84.6 KB Created: 2021-09-12 08:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ce97cf44425c569efba550fbee296f62 SHA-1: 53a568c20d16cdd78e64862537ab868a7b3634c9 SHA-256: 7eeb1a842373fccf16d1266c94b942ce9d8ed6b552bca1d35759ef8374a37ee9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a tactic to host malicious content or redirect users. The presence of a link farm on disposable hosting further supports a malicious intent to distribute further payloads or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f74ec8928cc343775b5e1b8757a03516/zekaz.pdf In PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/lixugu.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/41228103931.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/82554108567.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/lufap.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/76720923594.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/kibavedigofagidogabuso.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/2616049842.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/zigofagaka.pdfIn PDF document text
    • http://bptramptour.pl/files/file/49611890502.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/305670236.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/lonulumuvutelawanomo.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/resenuvasegobep.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/tipedufin.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130fef77b0f8---fisugonujidowipililutap.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161347e126537a---kopukenesikavo.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109111749332565.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/tufig.pdfIn PDF document text
    • http://vandofigueiredo.com/userfiles/file///45080351138.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613371b309c73---94891248167.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/86870295606.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b3cf152e3ba9510d4d15f7285c20d764/79789468902.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/toguvotavik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=real+estate+counter+offer+letter+examplesPDF 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_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3A 17600 bytes
SHA-256: 22ceee6f3a0ba581e52028f6153b7100634dee71c49bdf5bf495c8e31d734db7
font_02_sfnt_off00012bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB2 10796 bytes
SHA-256: 963cbf2c01392ee64c8d961e10777208d9d0d275d450b9daab1cd81e72eec22b

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