Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9698516ead9e2da…

MALICIOUS

PDF

81.9 KB Created: 2021-09-20 09:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 35d66ad57000795721a6335c98f7debb SHA-1: 284c1f429911fd0152054cf9ba03d66c24d4a8c0 SHA-256: d9698516ead9e2da1da306b3eb78346332036a7ae1211525a3d63f085dc5aa4f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users to phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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 http://www.cottagegrad.ru/files/file/13397675549.pdf In PDF document text
    • https://agmatbaa.com/upload/files/pagoforubisitowedebexar.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/47516260982.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/gupowijoku.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/95587907748.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caf1aee656---xisanuwezesugikaduxudeta.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/99182652941.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109160337124230.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eadda16983---57024001897.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc98535f13---8630485271.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/31385235737.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/fizixulajoduf.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210907_213142.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/7451030866.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/takamameziregufituga.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/gefov.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/julowupikurenorijad.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/39635143423.pdfIn PDF document text
    • https://rinducm1.com/contents/files/44569426132.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/losamuxirepefuremevikuxe.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/xutugarulidufujelono.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/jexuvelabosojexapesoxiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=no+ad+android+appsPDF 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_off0000df94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 17380 bytes
SHA-256: 93dfb2bc3eafd9e669b3c2857a60d8389e46cb5d0765a8eaf30a7750666ca8ff
font_01_sfnt_off00010c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12489 10084 bytes
SHA-256: 6e645647be249358f8e6aaa7acaf41dab051beb7d974f74109dcbf8aac09c362

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