Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7a26f8902c888b…

MALICIOUS

PDF

74.1 KB Created: 2021-09-01 20:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 33aceaab69526e64d6c663c23879fe48 SHA-1: 635c4c626d3c7b5fdd5d7a1d1606434ca7be06ed SHA-256: 2d7a26f8902c888b2f6e86a34c36585be9a6cebb8777047778f5315e05c049f4
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 as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a lure for phishing attacks or to distribute further malware.

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://chcial.ru/uplcv?utm_term=another+word+for+no+matter PDF link annotation
    • http://sintellect.ru/Repository/file/32240724925.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/7dca562b762ea6c7a357898ffecc421d/4218221016.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/5b0715b3d3083c485fcbfcbb1c751edf/fudupalejiwuxifetegusap.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6f19c79573691a002030b697e3faf684/77856561037.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d80fb5ff44275b07f6c53728361e7176/98564204929.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160724ecb350ef---64991797706.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c525c70eb34---liwijalupupuzofedim.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/80761909987.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/36696162141.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/73614293837.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/21658040680.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e9e9627564330925baafa6a023f8c11e/wiwonamenu.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984e874ba85---88322746819.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/kabebu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/44d83bcbba34508b87a06d434e4a3693/jonizufomorisutofexe.pdfIn PDF document text
    • http://webs123.com/userfiles/file/76607276541.pdfIn PDF document text
    • http://stonebreaker.at/wotomi.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/23928625669.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/midatiwusofejemer.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/35739844416.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7c197a984---61161777823.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/61523810758.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/josefabuworulofigiker.pdfIn PDF document text
    • https://jss-moms.si/upload/File/totodugovijaxezodenis.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/pulivaxe.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_off0000c189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC189 16100 bytes
SHA-256: 1811461cc5a7c102f4e6765ce3d130c706df69f7df96e5f90dbea642945d0b4b
font_01_sfnt_off0000ea87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 10380 bytes
SHA-256: ef91fd9e3512589592b5f2e05bc8821b191b7d6ee6de22bb5b73bebc412b059d

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