Malicious PDF — malware analysis report

Static analysis result for SHA-256 386ac3c0306b8029…

MALICIOUS

PDF

71.5 KB Created: 2021-09-29 11:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3b144b7f87d875ff549f92b54df5ed08 SHA-1: 9b137121aeadacc0249aa58f979860c033f615dc SHA-256: 386ac3c0306b8029ca34d85f331402053865222e50ebb9ac682f771a044caeed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious links, aiming to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://wastran.ru/uplcv?utm_term=telegram+download+link+for+android PDF link annotation
    • https://rajatotogroup4.com/contents/files/89918770373.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/6lupql1nc0ua19ecsn81dfov40/59617312944.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/rufelovegameduv.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161346e9f3a104---degolevoxexuder.pdfIn PDF document text
    • http://iscelenie.info/files/file/72264921402.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/nororujevipurigobigub.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/43343108847.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/gosuwodekafidipene.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/dorimusikozekutidugizep.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/xolujukuzuluxas.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/66731207223.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/35983840886.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/pivakasa.pdfIn PDF document text
    • http://freewest.at/77069177383.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/guxiluvire.pdfIn PDF document text
    • http://em-ail.ch/pictures/2/nikemusodotozikugo.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/2392037582.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/bogofunibafibexulawunuku.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16148f3c00f94a---27520102979.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/sagadisilusasabarepug.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/73410707902.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/c614d8f3e1718ecd0917c78abfdebc98/31663641882.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/likesepiw.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_off0000b382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB382 10572 bytes
SHA-256: b574ed7cd92be792123fdb0cc8f670a18160db0bdc564d405efa8539b44d76cd
font_01_sfnt_off0000cb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6B 17024 bytes
SHA-256: fc4021ef4af6d81ed9721ac912525615463bddac977ea177c49e0c9723fa1b2b
font_02_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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