Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba85a86d2e592b3…

MALICIOUS

PDF

77.5 KB Created: 2021-09-07 01:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf7ee0761c21ee534e9d0ffad4ca394f SHA-1: 7d8e68967355a46b1f8186ab4b3617c2c0dcaf68 SHA-256: 8ba85a86d2e592b3ec9a43eb6592c21565dc2bd27ef2e52d1e0db2b5117f120d
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The presence of a link farm and the nature of the URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110f90de7916---kikatolatoso.pdf In PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/58383183388.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/pusujugogisawokupezepaw.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0e47d8c66---denamukilutonibutaxa.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/sovifupepevisomijidakada.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/1c560a68483580a021573544bfda4c2d/xukoxirisunasolis.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/falefomaxixutojatoxejom.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607854a5eea16---razanixekisetejexelaxaren.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160731dc1ac775---46319506865.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/xekedijaposeviw.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/11074872188.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/jolavubof.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jinawilurotapenavig.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/80900060274.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/121543bf5aea4f8b1c41e48cbe7e5bb2/12428686929.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/55598853305.pdfIn PDF document text
    • https://mmszke.hu/files/file/rotiledokoxi.pdfIn PDF document text
    • https://attack.lt/images/files/5356983919.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/risadegeleponeb.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090c414433ed---82295411309.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/90884277206.pdfIn PDF document text
    • http://sepremprod.fr/www/images/mediamanager/modevoradiz.pdfIn PDF document text
    • https://laser123.com/geektic/files/pibaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=liver+cirrhosis+articles+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_off0000ccee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEE 10636 bytes
SHA-256: db16ca6ee386fba00f4f1722160536f9e3e0535bd86fcdb0b54875c30b0138ae
font_01_sfnt_off0000e56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56F 16648 bytes
SHA-256: 2e22aa641e9bfc3e66696500683f1945a9182d83d21b98fbcaf925b56bcbb3f2
font_02_sfnt_off00011059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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