Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf3d72014faf959…

MALICIOUS

PDF

84.3 KB Created: 2021-09-18 21:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 11a497bfc33b22b72a592d60a92da593 SHA-1: af8e48f8456aa0ab1f64fcbb94618056ffba9ec0 SHA-256: eaf3d72014faf959be5a07fe5d790aac64886501b193e36b55b5e60165abcba1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://konikanarrowfab.com/ckfinder/userfiles/files/bejububidevisotawawesalo.pdf In PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16145be8136103---zanuturukaliso.pdfIn PDF document text
    • http://mzch.pl/userfiles/file/96243613960.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352d34593a7---36395046394.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/davozafexurumekominuzino.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/46228580033.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e54188a731---96473087771.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffa564704e---dajorumuxopukajemawofuxe.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/66725867397.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/zetarepetanoderugeguri.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/sekanafuded.pdfIn PDF document text
    • https://dukupahit.com/contents/files/saworevixamenarawimosamax.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/wurudoxulo.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/xamujetopuje.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1e5f449cf---38225819608.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/10442406719.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/nazivelesojapon.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/32902474924.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/94031169275.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/viravitagoriwupoburixe.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/70636978401.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/38085222149.pdfIn PDF document text
    • https://abss.pt/userfiles/file/xamabizoxufon.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/39359894520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=flick+home+run+apkPDF 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_off0000dc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC28 10544 bytes
SHA-256: 680370982e74ae46f4cdca26fb40a7946e846c3ad82d180e168effe60b0d02db
font_01_sfnt_off0000f3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 21148 bytes
SHA-256: 5a2edaebe527256f0acd705bc810c3472361169702f5c12b731fe3a1ddec71fc