Malicious PDF — malware analysis report

Static analysis result for SHA-256 43b7a2b7c3a3b3dc…

MALICIOUS

PDF

131.1 KB Created: 2021-07-05 18:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ca8e3bcefc714de71aa4af6b8b562338 SHA-1: 11630c96bf7a927c49ddfc6e5eb127153aa3dda7 SHA-256: 43b7a2b7c3a3b3dcbe86c34a6c6d0fa4fa6f67f0a3459ad0b0beb792947cdc91
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 links pointing to compromised websites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of embedded URLs and the heuristic firings related to link farms strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=it+includes+both+mitosis+and+cytokinesis PDF link annotation
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6fcd816f799f233b7d716cd923cb997a/fimogotufapetumu.pdfIn PDF document text
    • http://immopolignano.lu/images/wefodigomesanoge.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838e27104b1---zirujukuzunaguwuzazapenu.pdfIn PDF document text
    • http://consade.com/userfiles/file/64615450104.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pokunufowore.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/30515949313.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/m5rmo6elnc3q7763nf536kr2mj/wanejezumunagexonoboxeb.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a565aa025da---zixubumaxopebatitepuv.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/56660453481.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/15226030942.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/leji04hf9boqbfujq8fimlilau/padigofabovezo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087450dbeff9---59421711061.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/81445773625.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8efc2cede6---rukozefezotu.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///dixiwol.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/74091213667.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/gadiludajigusarelizin.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/kvvf9ol7i360edtu0dulmqmj2a/jabavijopunegugasowelijuj.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/pcasb451h8jimfog9jt4sk2q3d/60509044313.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b3fd6ade6---87635319047.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7a5ebfc1---45991938095.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/uiqrgiep38b84icai4bpu7bqsr/todeg.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_off00019ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B2FA 19636 bytes
SHA-256: e83e1a8ea231ed72571f5344c5a0aacac6cbc698879cdec5221daf9327d45614
font_02_sfnt_off0001e5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5F6 10932 bytes
SHA-256: dee84d94e47f207d1f06effe173006c483172287914fc890ee66b1e6e779685c

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