Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc321bc8179a45ed…

MALICIOUS

PDF

82.5 KB Created: 2021-09-05 00:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c884752676fe2931658f5a79d3d84300 SHA-1: 742f406e01ac2c8574594635725564055795ead9 SHA-256: bc321bc8179a45edb66fb8bb077e60a3d5bd5566941f56fe91f8c8b74227f3e6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and multiple external URLs, indicating it is designed to redirect users to malicious content or download further payloads. The 'Password-protected archive handoff' heuristic suggests the document is part of a multi-stage attack, likely intended to bypass initial security scans by encrypting the actual malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=ielts+listening+vocabulary+words+pdf PDF link annotation
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ed43304b7---22148388715.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/mosonanulov.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/53332218686.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84607ba826---rivoxezesuwolariku.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/xibirutebobawu.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/43281885983.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/68037267250.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/boxekixurimodunawi.pdfIn PDF document text
    • http://93564497.com/userfiles/62688548853.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16095bd3506aca---bulodupakubutim.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/sajebomenew.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/806599ed17c96980861ff3117ce0fef1/36122073482.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bff08d30c8a---wokopaki.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/69432464134.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070137bcd1f4---foranem.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/ximugiduzetijugulubasez.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/nelonuli.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/womiwunepumoxipi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087435c3eff7---pipapuxotegutirular.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f09bf0c3---89674936431.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a849aed9611---7777810663.pdfIn PDF document text
    • http://martonelektro.hu/files/file/raxumim.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/mobavasuvesita.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/092037128881.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/79787391456.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16074d089015fd---gireru.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_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 18204 bytes
SHA-256: e5d9235a025178158f9d5219bc3ae12d73a770c02a437ae8fad9da055631f85e
font_01_sfnt_off00010a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001225e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1225E 11252 bytes
SHA-256: 53254b28d9a66977d2c8b50f296541e7948965da3d2c2cdd3942ddb2cb393cbc

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