Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c56014a83b953fd…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 10:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7d301b310ff667bba592df0b80f0762a SHA-1: 0c77edaf2efffac5a65341e94a11565e2cb6a0e4 SHA-256: 7c56014a83b953fd14c7725aaa0244e78fa303f4a8216f180f8d6ace02d11ed0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate the document is designed to host a collection of links, likely to facilitate phishing or malware distribution. The embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=how+to+free+up+external+storage+on+android PDF link annotation
    • http://kapsalonvogue.nl/files/file/44058592263.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/wivavaf.pdfIn PDF document text
    • https://ckmandarin.com/uploads/7778872552.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///24719281604.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/37a3ce1de8f1947c7c509acdb5b5fe60/gedazipuw.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/kexawigo.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/worunoxefef.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/fuzexedu.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/3d24c087ea4a9a0dfcb61b0f27d06eb2/2725493394.pdfIn PDF document text
    • http://neoclassicalmansions.com/uplds/file/vuralal.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/jakesaminit.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/93899515881.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/puzilaf.pdfIn PDF document text
    • http://logicamail.it/draft/media/66344059480.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/voliziladulasowekaz.pdfIn PDF document text
    • http://roseeskin.com/userfiles/file/20210917225954.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/60246202816.pdfIn PDF document text
    • http://ptktent.ru/userfiles/file/nokezujeludazofid.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/masoxelupawupizep.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/doromewewubepar.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e959ecef09---popom.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/20516819737.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/82692468996.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2f234e5e88b01b2759f59371e8a3e660/36582691120.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_off0000d71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 17936 bytes
SHA-256: 8ba00d1c290183019b9e971dad40d6ecdd333eb2a177761e23157fd7c387cc5e
font_01_sfnt_off00010652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 10952 bytes
SHA-256: c47af6908ad1624b67c9ef9de13ca427eaf7a8f128bdb1349131323498e9e77d

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