Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c07956c08c904f…

MALICIOUS

PDF

77.5 KB Created: 2021-07-23 21:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7c2c13da2eb150bbb70eb3ad1988f751 SHA-1: ef82d820ab74dab68870b5f44ea7851b397142f2 SHA-256: 66c07956c08c904fc016f2ad4e5926562037252beb4582a1b62a11d558fb78a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/pawenoxukutudizus.pdf In PDF document text
    • http://yfatc.com/userfiles/file/vedafi.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099aa17d4424---mesegasidonufip.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/fevabipivurivab.pdfIn PDF document text
    • https://digireg.se/upload/85638236061.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/51166207513.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/nirenakelefowup.pdfIn PDF document text
    • http://vizcsap.hu/files/file/53475564259.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/41920589296.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-14/20210614012405734464.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/34486068372.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a9573747c---wawetorunosopojekaf.pdfIn PDF document text
    • http://rinsacars.com/files/others/jofup.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/098241f61d301074f7d7a14c9a9c2d4d/dodetituvajabowavakaf.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16086c7ab5f1cc---97104559327.pdfIn PDF document text
    • http://tano-cable.com/d/files/10799206159.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/2424176597.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210606231042.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/33c7522296828847e3482424f9625d5c/86158092032.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25458477962.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1965fd4a67---34862391156.pdfIn PDF document text
    • http://unsersohn.ch/images/file/32928918435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=libro+extraordinarias+mujeres+de+la+biblia+descargar+gratisPDF 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_off0000c908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC908 16708 bytes
SHA-256: c298231c87e3892666036279f6fcbe8333f3c9ff8711643534a51ddfe19d688d
font_01_sfnt_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 11144 bytes
SHA-256: 17998c214aea3cc0e23266fb4d30742cb80717a6dd6c532fca45fb8cf27dc5a1