Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a96e0a72c3a304…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 12:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d8129b61d6ec3a2fe57fda4e7ba504e5 SHA-1: cbbd4ecab90748554c4489f598d0d37eba123c9a SHA-256: c3a96e0a72c3a3046686a0f56aa06d2c9a2f80d53739f0d641d32366fd825578
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware downloads. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=cpcsea+guidelines+2018+pdf PDF link annotation
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bea96f84f9c7e8399430a897f842d556/sazaboxirivilifuxed.pdfIn PDF document text
    • https://kueapem.com/contents//files/besezivanuwudademe.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6ac242bc2---zomigegowedijozudoteparen.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8a8c0bf5b2f25e85e03c407b48c02739/molusireziriwagom.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/juxirinedotaxojeze.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bd7dc0646---fevukitubaganakupi.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/dalidizozamagap.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160907a0f0a898---velidibelusavetenabawoven.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607db80a616de---28344096654.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c5932f6c---pimixorinijivolobo.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610c15c036420---wazupot.pdfIn PDF document text
    • http://jarosi.hu/files/file/56424955418.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d9cbf39040d872eb4112a0f80c0c3231/lekulojejo.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/pixugugokijifu.pdfIn PDF document text
    • https://shidoremicrosys.com/media/fupoxubifevivot.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/8397ff3afb4b0a0ecebb484223c41ef6/56897963683.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613103947a0d8---towexalubeweg.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/10159963913.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/dovagirenagirapuw.pdfIn PDF document text
    • http://www.emailposte.com/pictures/xonum.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e0244c45d3ed92a7cb0be39f90dcd3e1/sivatukekabuletaromap.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_off0000c4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F2 17132 bytes
SHA-256: a1c6dd2a9aa14a0b9315e0d0a32394b1cd5f9587579807492a751d3e5241fe59
font_01_sfnt_off0000f1c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C3 11108 bytes
SHA-256: db832012ee4798cc85f72a3699963088ce598fc4cc2fe9959a670d11067ae08a
font_02_sfnt_off00010baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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