Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b9393579537973…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 09:23:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0a2d5f3b4f1c9d0118dcc77f7d9e38e SHA-1: bdff95e23ea98690cd063c2ec9982284ae8bee23 SHA-256: c2b9393579537973841b6016b6d414a1ca78fb8710bd50cded28525d938429df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates the document's primary function is to direct users to potentially malicious external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=creating+pdf+file+c%23 PDF link annotation
    • https://ei-hotel.com/free_images/files/77019877094.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/kiginujeroxefubiv.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/93628320818.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a677136a163---90053232968.pdfIn PDF document text
    • http://fotossc.pl/_files/file/17438430771.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/22289f3ad5988e07c4a794a2f06832bb/sovepovesoxenexofegidiru.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/14364945312.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/90110302566.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/27288606890.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd8af4aecc---wozisosarakepobabosiridap.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/pidjj0ujff2cce8ff04uidt6f0/22840312621.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081503253373499.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/18734529237.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610e05bdb960b---pirexopubudavefe.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/6lcgbgi671hmbd2m13e1v24qo2/69805974367.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/57596204885.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cdff2ead2---36817411473.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vm19imevo8dn94d5u6suhesebt/dipojubopozeviwikarus.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/sivipu.pdfIn PDF document text
    • http://vejwun.cz/images/lodab.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160742fe6356e6---99577003584.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a273330f73---guzonepuzurositepibe.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents//files/19122143369.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16118a94f5e0af---26018706510.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_off0000bec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 16676 bytes
SHA-256: d1d8eb1a5e67621ccb82cb52ee771e421896b7fb38b379439110fe2abd181839
font_02_sfnt_off00010275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10275 10536 bytes
SHA-256: 98dc871ee3ffd6ba75f1b01752b4ad949406b7a0faa4d2bd9a61a9b0c19744cb