Malicious PDF — malware analysis report

Static analysis result for SHA-256 b34c3426314eb479…

MALICIOUS

PDF

84.0 KB Created: 2021-07-02 04:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a78eeaa4e4f95850e098c06841ca4de SHA-1: 16ec9292ccb5d89bb57b89d5ce020733a46436ef SHA-256: b34c3426314eb4794cacd8dd360180399a58e27a92a55500a382f53d5dd23143
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing. No scripts were extracted, but the presence of embedded URLs and the link farm structure strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=after+what+height+of+construction+the+scaffolding+is+required PDF link annotation
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609b21905bb19---21013110067.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/xarujosigapu.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d35de2b4bf---28532065011.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/99855556510.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01ee9a540---xeguzivokofob.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/24699849092.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1665416a3---pofofegixinusuvuva.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d12f43613---vimugetazilujapiku.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/179678710160b04041c236b.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d52fcefa0c---12097813477.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d9bb8cc8c---81611455544.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/17c183f779e910b053fb3c35ae13b818/jidujikawazulevenubun.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a08038e36ea688817eba9f42ab9e53ea/555595847.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160930b4d2fd80---kokitux.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c12fe3b2df9cbe38d97f6c60aadd3c60/gojumebududafogode.pdfIn PDF document text
    • https://thietbiytedaibao.com/media/files/43941468448.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/gofosagikopowumolu.pdfIn PDF document text
    • http://merwepizza.com/upload/file/dital.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f571dea27f12237b29c901f0eeda8e6b/24869357453.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16082cceb75cb2---pusiz.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/79251642437.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/duwana.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/40527102627.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/3959755169.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_off0000e675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE675 16260 bytes
SHA-256: 1ad31534798ad17cf3b145b5a84e405d58b2b676a031b5941355c65e97a76836
font_01_sfnt_off0001108a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128A1 11068 bytes
SHA-256: 86c039c59e05d594e5f4a77b398023cecd53e4a75ead4307c276c32cf41ff755