Malicious PDF — malware analysis report

Static analysis result for SHA-256 511ae94ece543728…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 01:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 993db8ca17aece03c304a9394b47bb18 SHA-1: 2034e57b6c8945d61b4c52a746dc89ec15298f91 SHA-256: 511ae94ece5437287345a73a48f30442d8b2337889076b9dc6281cd9e729dbf5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=wallpapers+para+android+tablet PDF link annotation
    • http://ubest.ru/images/file/zojuvuga.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/65515049966.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/38176989363.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161393c7a8ce3e---61435198284.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/wamumuzeguvomufofiz.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/nepowalepupivagoliles.pdfIn PDF document text
    • https://xrtradingfeedback.com/cmsimages/file/zumivin.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/17629981031.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/75534106283.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c23284df6---98465798694.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/pazimolaxagux.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feba0c8824---gipufapiwofegexesaruv.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/gilovewejifejafowifaxo.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/52852062657.pdfIn PDF document text
    • http://canadianrockies.info/files/file/dopaganofanepefonibaji.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/nuwaveked.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/zagariguzomibalukebeza.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109021222309764.pdfIn PDF document text
    • https://medpressa.ru/files/file/wawelopowibamebulid.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/tawodaxegirepaxozemuke.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/55808134367.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/jogutaratog.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/segiko.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_off0000db3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF351 10516 bytes
SHA-256: 490b6324c8a0107ba72b51d1de444a91a71e2f4f76f4d07b8cb404e79756b7a0
font_02_sfnt_off00010b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1D 17800 bytes
SHA-256: 84ab29fc4a689974723fc62bb46d086f72bdc59a87f657010a36ce05c870e732

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