Malicious PDF — malware analysis report

Static analysis result for SHA-256 9acb042cdec87b37…

MALICIOUS

PDF

80.7 KB Created: 2021-09-23 11:31:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dbc04ab4da877886224f8100c5deee19 SHA-1: fde9502634e2b92c358a8a064f14b869b6f8d311 SHA-256: 9acb042cdec87b374f91eac361a6690d4557bd12bf2e1a32b1a3c4eb68085fb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of a link farm designed to attract search engine traffic. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. The document body is heavily obfuscated, but the heuristics indicate the primary goal is to redirect users to potentially malicious content hosted on compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pistant.ru/uplcv?utm_term=dungeons+and+dragons+player%27s+handbook+5e+pdf+download PDF link annotation
    • http://foto-klub.dk/userfiles/file/geziz.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/manizen.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/5528884170.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/bexubadetonexowo.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210906204721.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/17519371637.pdfIn PDF document text
    • https://www.phuketvillarentalandservices.com/ckfinder/userfiles/files/57850912518.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/vabadirodabetelowakaw.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/rikojipotevujigozifobof.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/ratowisetut.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/bonugav.pdfIn PDF document text
    • https://preciseenergygroup.com/media/70992393383.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/10dc1a4e3c01abcbb4950465e179def9/remuro.pdfIn PDF document text
    • http://djpress.pl/Image/files/78552427669.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921929f76f---roziladekatut.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/tatixatofibojeluzif.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/nusajazisatul.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475845711c1---27031813356.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/26173865487.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/bavebemesagumuviw.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/86cd9de339c51324a1e686348115c15e/10559632172.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7e1e12c5d---zamazovavigakowipex.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614572da9e848---zufid.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/89088565940.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/34843219603.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/60636530068.pdfIn PDF document text
    • 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_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 17060 bytes
SHA-256: a0519d6d3a330af3297c073a2a58ea775c00bbadc9fd9b5a081a7730b691660c
font_01_sfnt_off00010230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10230 11288 bytes
SHA-256: 92fe5b67c53f1a5f45b7d33f2550b5f8a31c77436b59bb809e7fc22554bccb1e
font_02_sfnt_off00011c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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