Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c89158d3d6ba36…

MALICIOUS

PDF

78.5 KB Created: 2021-09-12 15:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c1f5f46d3092b98b6fa35339ae92830 SHA-1: dc8ec2d55f1ffe5c6873334e54fda75fc5c8a983 SHA-256: 36c89158d3d6ba36897461edfe05748e90c45e1d214ca7d6f7691f75fb5bdddd
156 Risk Score

Malware Insights

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

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. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or further malware delivery.

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://infrive.ru/uplcv?utm_term=how+i+download+youtube+video+in+android+phone PDF link annotation
    • http://mtkshop.com/images/uploads/file/26165204803.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/vetos.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/d9298dbb5968b1175deda14f1f64bee1/sodedupi.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/zejop.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/nuxonodijubatenosijupite.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613627490ad6c---mofexe.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/jaludanavafinunidinakudiz.pdfIn PDF document text
    • https://masihpt2.com/contents/files/35268166312.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/kozenawapob.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/85435365452.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c20a1e6bde---54499331297.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5223d74b---juxaf.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/towifoxebixifunimemiwex.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210907192046832.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/rosugukifujo.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/42133801518.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/54643192093.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1630786284458381777.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/wepomoxanokowavolifofawe.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/vebowobomipubaramakomides.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/gejinapibejaze.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210904_4DC698FF5D72AF88.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/20016556792.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/nalapelomasudobixafuvipev.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_off0000ce39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE39 17280 bytes
SHA-256: 0a684a74ff0eb4c9c74f0ccda0174f780a845c8ed2a801ea39ce7c23c7a09dfd
font_01_sfnt_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001134e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134E 10816 bytes
SHA-256: da0ee35623661a6c0cad274aa8b533100c9b817a15a12e3db4427e2e87e6c071

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