Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a2a1343f5da5c46…

MALICIOUS

PDF

71.2 KB Created: 2021-09-26 04:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7acd1c18f2e08f769208ab74decdc195 SHA-1: abe18bb4fd8741d27286dd1d3981d60a20aa9497 SHA-256: 6a2a1343f5da5c46e8ff48dfc3db54aa7f6293ca7b939b2cc99ac19221be025f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URLs, many hosted on compromised or disposable domains, suggests the PDF is designed to lure users to malicious sites or download further payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the idea that the document is part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=mario+64+rom+ds PDF link annotation
    • http://ncdesign.it/userfiles/files/naxagim.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/xavorotuwetar.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/56163473901.pdfIn PDF document text
    • https://sledovani3.gpshlidac.cz/www/userfiles/files/55232834051.pdfIn PDF document text
    • https://renewone.de/files/7005179208.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/23147530006.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16144c7721c90e---tupuwejagilokokeduregadu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/2a8908aae6fc6c3477d3e1d0b1aced37/rozorowisivoxadojapetaxok.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d3900dd4---35131908661.pdfIn PDF document text
    • http://arucax.am/user_images/file/wajilodinutimemub.pdfIn PDF document text
    • http://bdn10.cz/files/file/44673130024.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/94443367901.pdfIn PDF document text
    • https://subarini.ro/mm/file/51496450587.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109030456326090.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/35659160545.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/139582513.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/sanijekonowi.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/dulojun.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/xapedosogavekikop.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/57167531419.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/rowusigezefinajozibuki.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/nebululipuworopefofasif.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/biloxozubil.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/zadevifawepojukitafo.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_off0000b3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C9 17408 bytes
SHA-256: 30814123d9fdea10cc0edb4f050e5b99a68c0a0dda9c35dc176131b276bdb797
font_01_sfnt_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 10268 bytes
SHA-256: 20b21f628a03f44481e168fbbf43576788855fa24fe3991e4049f2d0a85bfa86

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