Malicious PDF — malware analysis report

Static analysis result for SHA-256 02dde5eea5cf3d7e…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 06:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 059784650d4ce1b1de7f783f4c852e6f SHA-1: 6c121364ff4f386749896eea4ead3b541a93703a SHA-256: 02dde5eea5cf3d7eac9be6f04d615067f6f0b9d658b592c22c915a5ff86b3602
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, some of which are identified as compromised CMS uploads, further indicates a malicious intent to lure users to external, potentially harmful, resources. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a phishing or trojan delivery scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://aneri12.cz/res/file/dekexoguwugesod.pdf In PDF document text
    • http://kozhencherrymtc.org/userfiles/file/51599196431.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/94304528517.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/21ee8be0ef8ceba6e72c8aad849ecc03/29028700392.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/mumojawurebeke.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/68621427469.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c067114b32f0ccc2a20c017beb4acf6a/fenuri.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16079f77da4632---pufigi.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/zurasujuzezekejixit.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf55c60a71a---54237383769.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/birozatevirovan.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/87824671671.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/54141983492.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/kitogisepexikadesovaxudib.pdfIn PDF document text
    • http://runhouchem.com/upload/files/wojijubi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a391ccd45e---suxumewejotej.pdfIn PDF document text
    • https://premium-house.uz/images/file/11818943498.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608745a25e879---18085484231.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/kawuwidizeje.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/rizitatobidamupukiboj.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/bizudej.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/zusupoziximileda.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/fekipunukafodavaduxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=spinach+filled+ravioliPDF 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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 18092 bytes
SHA-256: 5aa79aaaa907bef07bb7a0c2786ad992ad1217d357fd0026c52e411e7a4645a5
font_01_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 10592 bytes
SHA-256: b6a67f5fe863839bdb2b8f6a082b6a21559bb726d7944f2ea0035c8bb4e5d16b
font_02_sfnt_off000126e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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