Malicious PDF — malware analysis report

Static analysis result for SHA-256 d27c45b437d1b28c…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 16:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ffbe2f2f489706298cf098dd1c87bc15 SHA-1: 8d13780f8b80e99e241facdae7dbf44ea4b9e8e2 SHA-256: d27c45b437d1b28cc3f89b2dfcdf00885bf069ab017df589dd7c887cce33a925
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is used to host external links for SEO manipulation or phishing. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=piperacilina+tazobactam+farmacocinetica+y+farmacodinamia+pdf PDF link annotation
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77275135d1---88918031463.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/cv8k3aaiqkqqb1v9ehmkmn5v4v/beditapopezanagigatunatan.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607106517966e---fowuzixidopolebawivewadi.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/kugolibagivogotokejax.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/ratozibazikazebagi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160892aeb2cf5e---zenujoxikutavupazi.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160717567ca04e---jekosonoridijiba.pdfIn PDF document text
    • https://jv-cms.crazy-jessie.nl/uploads/files/58834727538.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb6b3bc12a---81337650820.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a56e85706a6---kuguzidupawexixitepifaj.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/e8f9a1b09e27219d77f938a5d9d695cc/xefazorimu.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210803141952.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/39e244126510e25ea646569661e2fd62/29238960605.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/gepusarutapinam.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/mopok.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/bulufejolanajofukafipewig.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/4gm5ec3ub0rlke08ao7p97flc7/91195798750.pdfIn PDF document text
    • http://wohingltd.com/userfiles/68846875838.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef37620716---sakogefele.pdfIn PDF document text
    • http://sro52.ru/uploads/files/tudisoxosalutukejigev.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/63459618722.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_off0000ca8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A6 10928 bytes
SHA-256: 8fd816e69539e6abbf57f35d6cbb7e82922fdddfc445436c2c7307d69808c418
font_02_sfnt_off0000fbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC4 18684 bytes
SHA-256: 4b47704986181dee34665b792b7f49d4c4164c0f3b93769b5dcfd6b5cbeaee0b

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