Malicious PDF — malware analysis report

Static analysis result for SHA-256 961ddecde7daed27…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 07:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8551531ab55429f44be8f68e26772186 SHA-1: 85574df2f0b8dbb3cacd09fe0b6b5fd14b98a6ac SHA-256: 961ddecde7daed276f031922ed5271b604266a57491482b770bd0cafe7c41d4e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address and others hosted on potentially compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions, while the link farm aims to obscure the final destination and increase the chances of a successful compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://garglob.ru/uplcv?utm_term=bose+companion+5+multimedia+speaker+system+manual PDF link annotation
    • http://redsky.tv/userfiles/files/83661708277.pdfIn PDF document text
    • https://aashianarealty.com/file/14864368453.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/ganetupisojumazenofasazid.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e22d37c5643e9214c460c4242740ce31/15746893688.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/n58v7neccoqg7dgnrb2nb7uvbs/gisosog.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/tebulexalividaf.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/23834598338.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6541aabd2d---86712678573.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/43ku64mao4ctduj35phuo9j7qj/zodowazafizufikapisiwube.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/87795264620.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab0b105d299ec8245b46eb7b7935463b/fefivi.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/08-26-11-17-20-30.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/15055479337.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/91375968298.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/jofugunevexob.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/javepumeledawozip.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/3927069950.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3e6db9bae---tasamasidi.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/91673944936.pdfPDF link annotation
    • http://tivatijapan.com/uploads/userfiles/file/simokifivetutozaz.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/xekatafanat.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd38be3da5ebea2a9a377c033f2b7760/74831031178.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/tosizadogejirer.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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 11168 bytes
SHA-256: 107ece108f0e8c2bf82fe256927a2bf5af2a126a664fca6a552fc38096d66833
font_02_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 18696 bytes
SHA-256: 6af1a996a3fb81f5a2a28000eb52528e9526395417848f6d185280aded1aa62c

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