Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda4c68e47b8c52f…

MALICIOUS

PDF

95.3 KB Created: 2021-09-13 22:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e061914e5e73c73665ffcc6a27c1f3bd SHA-1: 0a759b705414649ceaaa9fac91cc8ab1ea3ef5e6 SHA-256: fda4c68e47b8c52f09a4cf699c56f33f2b4c094d8b7fca2a89594863afac1113
164 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms, with several heuristics indicating a compromised CMS upload storage and disposable hosting. The embedded JavaScript stream, along with the ML classifier and ClamAV detection, strongly suggests malicious intent. The document body is heavily obfuscated and unreadable, but the presence of embedded JavaScript and the nature of the URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://mudrkanuch.sk/editor_uploads/system/files/totigudon.pdf In PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/fufenedutaganubekorenu.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/58933835215.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/67165078498.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/70013377728.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/83691006052.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/segewosugi.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/24795524964.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/bodenoxoli.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/popuzine.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/ripodi.pdfIn PDF document text
    • https://adetexfoamgroup.centralcms.cloud/galeria/files/gatetelo.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210911150725_402441167.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/jipigarevuxudakomej.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/64331407086.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613707ba36b57---diniza.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/39341776696.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/66310981123.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/14636101690.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/pdoqgdk8tssj3gf9vbopie6a2q/1617585809.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd0fcb43aa---37891710828.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/zerenivakulejes.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/97230045889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=android+handy+pc+softwarePDF 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_off00011093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11093 10852 bytes
SHA-256: 994b4055bf4787a6063f0796394c6062df313e9539e9d06a92306c8712e10b25
font_01_sfnt_off000129b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B2 17948 bytes
SHA-256: e2746ba1fbe92a3162321065bce2335d42fa84a669ca03dc8740348f9376e995
font_02_sfnt_off00015704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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