Malicious PDF — malware analysis report

Static analysis result for SHA-256 41af11701e469d0b…

MALICIOUS

PDF

70.5 KB Created: 2021-09-17 22:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f62f2e9112bdab2b350a5c1c23216db1 SHA-1: c0205b01f9c36e58e3753e429063ab84731caf81 SHA-256: 41af11701e469d0bae393a495c41c16f996b9e192b1dc43ff0b441d73692d7c7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of a callback lure heuristic further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://digitaldaya.com/imagenes/file/4968571630.pdf In PDF document text
    • http://moretonassets.net/userfiles/758250874.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/vometinukatubo.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/b54d2972e475c402244a30ab62a7fced/vesomevokajefiwemagike.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/4655075477.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/dutoxuzekedoz.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/675e2d400cfa5b8cef0ab6af280ad072/83543345971.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca808b127---mupidirix.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vp66ajrpdb8nnq7g9jtjcntds7/jawev.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/71870161717.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/jasojemapadudogura.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/karadenesaluzaresigaxego.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/96329357869.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/fg6v45qod8fbvf86ucceqk3rn5/kabitugokajiluso.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/repexe.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/69532205990.pdfIn PDF document text
    • http://jin16888.com/userfiles/file/fifana.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/wewowufixukovajefiji.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109040630292292.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/85439741637.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/45905174065.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/kagefa.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613e21440aec2---80759059700.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/16624220734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=forza+horizon+4+free+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_off0000b6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC8 10348 bytes
SHA-256: 6122b7566623149adfbb8ebd2c41febcec02fdff2dcb5b58572bf6dce2c079de
font_02_sfnt_off0000e614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE614 15172 bytes
SHA-256: 4bbe096c5119168d8d83b14146d096786cc2a323d68f404891fcbcfcb48b8552

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