Malicious PDF — malware analysis report

Static analysis result for SHA-256 c482ca59c6c4edc7…

MALICIOUS

PDF

70.5 KB Created: 2021-10-03 02:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0a62f681096dce90cd180038a6847a9a SHA-1: 9132b4121f0684631bd1190afe99d192b484fb85 SHA-256: c482ca59c6c4edc79c8549903fcb11e34775f6501c0e523af4e439505ef02e12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS upload directories or disposable hosting. These links likely serve as a link farm to redirect users to malicious sites, a common tactic for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://allytemp.ru/uplcv?utm_term=nothing+but+the+truth+study+guide+questions+and+answers PDF link annotation
    • http://exim5.hu/_user/file/mikefikuk.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/gapebuzuga.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/772151c0dada09afb8058fd0941e1fbc/jukiw.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/44713527907.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/gajimejipajevadumoful.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1614052a0c6f36---netof.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/volipaziviwitelaz.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///91695407224.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/sotojunukisali.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/wilosob.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/30630613618.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/63950699854.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/sujigejesixefek.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/a06cec3eob020nqr0i3n4pkqco/98583349473.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/61352205766.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/16974974877.pdfIn PDF document text
    • http://vecsecity.info/editor_up/36936315055.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/jaxiduderubaxelo.pdfIn PDF document text
    • https://irrisyst.eu/files/file/4069458265.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/dukususuv.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb3ce1d25f---geniralurudevuko.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/22059246994.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/18108948341.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/dekanukiso.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_off0000afa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BA 11044 bytes
SHA-256: cfbc090d7dfc2848006718b2068b1cb8b989b375731c215a7205b281e7300a9d
font_02_sfnt_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 16228 bytes
SHA-256: dfad21ec0bd71837f3f0040701b8b2f66d53c31ef72cc091838e144ac8ffe284

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