Malicious PDF — malware analysis report

Static analysis result for SHA-256 6918a060215ea43d…

MALICIOUS

PDF

90.8 KB Created: 2021-07-24 23:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 54de56b3630b3b059974ff185011ecae SHA-1: accd8a740ce4249b67038f6aaea8db4f089dff94 SHA-256: 6918a060215ea43d53cf5ec226c0f78a6bbf9bb497b990f24e3446d4aaa65c11
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV both flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, suggesting the primary function is to host these malicious links.

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 http://artecgroupservices.com/imagenes/file/65298017074.pdf In PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c24d25dd2---galeredozapafunum.pdfIn PDF document text
    • https://avela.md/userfiles/file/zewavaledimudagipuxa.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/98741506079.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/nusoxojaki.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a69b8aeb55be823a29f3494d1da8cf22/33325950656.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/b0fc0c70bc6d753b9ae43be0dcfce23f/44923547528.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3848ac97566048de19ccca3788552426/38255112396.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a362786ef1d---73747200312.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/femavimotininetotalufax.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/18072529409.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/gebemarenasokizafuvenajet.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160757b1b3e1a9---beziwasazimoronigodedibiw.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/adafa33cdaa18ed13eb548348272415e/tozuxedusixikibamugoseru.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/58125721317.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7d13d199c---71668874733.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/54493657963.pdfIn PDF document text
    • http://teraval.cz/res/file/fowakitogitixaxabixa.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/86193130448.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/vegijoduzit.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/36637200523.pdfIn PDF document text
    • http://shadesvalleymounties1969.com/clients/868959/File/28640155047.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160921fa0a2452---11196966029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+box+social+james+reaney+endingPDF link annotation
    • 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_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 11168 bytes
SHA-256: dcbab92bff5ce1e2ab14e19dee5662dc895e14b6f97e97c5d3f5c154b81aa524
font_02_sfnt_off00012aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA7 19320 bytes
SHA-256: 6ad06728b2006403053a2f4cca19bdfa771ca8965101fabbee56e3d71bd98b9d

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