Malicious PDF — malware analysis report

Static analysis result for SHA-256 600a1f811719e72b…

MALICIOUS

PDF

76.6 KB Created: 2021-09-10 07:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 634b8b9da88be45a698cf2dc2b0f6ce5 SHA-1: e9c90ff76d61f9278249b0739f92fa6deb071a54 SHA-256: 600a1f811719e72b7a6e9159a124305d59fa5200250291172c2e642f98be6abf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a phishing or credential harvesting campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=credit+card+android+processing PDF link annotation
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38295428464.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/60036688298.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/73295165047.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/9064359881.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/lizadanadipibafinolel.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/625d23319ccbdcd8b89cdabfd00ace57/fudupufirazisavisorini.pdfIn PDF document text
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/foxexubitopepukumijon.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109090848136320.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/zezoliwarasikajaxabupog.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/87995474804.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/xajudawura.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210907074726.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/palawexugebelebisozo.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/lobegitarewagepevaporima.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161370339b5c7b---kalotawewexuxu.pdfIn PDF document text
    • http://artediapharma.com/upload/files/zusilutisomaturot.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/27261350354.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/newizunusevi.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/tuvinowu.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/retawok.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/45632112167.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/bejenutijewejeboxano.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/1b6eaa3353fc4c65aabc870f4e1e9843/dupibodevugivuxinimesafe.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_off0000c703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC703 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1A 10672 bytes
SHA-256: 4601db0f8528be0586c747ecc175b6c8a24879a367eb582d434c0b6c45478efe
font_02_sfnt_off0000f77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77A 17500 bytes
SHA-256: 87d7d0f20d5bb0d21c0c85fdd066aab93333b8e9a052e7fb8caa8c79a494131b

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