Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee32666ad173b7ba…

MALICIOUS

PDF

85.6 KB Created: 2021-09-06 00:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2212b8e15fc8a0b9e638c0cfb5118788 SHA-1: d1b42dcfabb8822197097b6bb4ca59aa03ca1d81 SHA-256: ee32666ad173b7bae437c7394264c8cc7ec4465c2a3cf9b15acfcbe01dbd3fea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable domains, suggesting an attempt to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

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://infrive.ru/uplcv?utm_term=2014+subaru+crosstrek+manual+mpg PDF link annotation
    • http://mmckno2010.zkosuchdol.info/files/16945908755.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/wazewigiralanoxuvekut.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zetegixa.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996e6d121a2---gutabigixa.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe29e1d6d0---kasotu.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/dazegifogoraza.pdfIn PDF document text
    • http://epicridesnepal.com/files/difejidoronedizuwagejan.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d33125b65f---velogibozimesikuvane.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/b6bcfc0832c2237971f8e40d525f8625/nigamago.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/tagitupasupirikopofof.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f22fe1ddd50f38f8c1b9053e0a49e82f/jasetixazuxaborel.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/16758468447.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/96970224654.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/pegareb.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/37919275935.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/32968841702.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/dogifaxov.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/909d2170caf547d849e8a74092e777b8/fopeguram.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/q6g1pshu6j5331v1bap276fk13/45097394066.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/45566783391.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160711a81e69e5---81054261854.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7052ecbbd---vodase.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc01f686cd5---17892707256.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/4f7fec954f032195abca0edc8c6c6848/xelinikujejunikipopotesi.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/7f9241c16826517d204892119fd53e2d/pagofaromuzibakosewifumi.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/zagazobepe.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c599b652f1d---nijexuguziw.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_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 18476 bytes
SHA-256: 6c484598b922f564e029343d741ac5c15d9d005c0836ca51dcc3d215b0ee9acc
font_01_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 11232 bytes
SHA-256: c118efcf1d2fb66fd0fd810432d3f9291e47fe5d83f8228b2c27fca533f0f000
font_02_sfnt_off00012f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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