Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f37eeb617e2078a…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 14:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb03e4fed96b910cdb09881191f4c87b SHA-1: 56989d901a12315d214f22d63f4f32af0e9e3348 SHA-256: 8f37eeb617e2078a27af786c7eca72ee1551dfb7a460fed424a6224eebf4db7b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to phishing or malware-hosting pages. The presence of multiple external URIs and link farm heuristics strongly suggests this is a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=laars+lite+pool+heater+manual PDF link annotation
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdd518cb1e---nipezibatozorilo.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/66934156094.pdfIn PDF document text
    • http://safarang.com/basefile/files/vifibaj.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/suxomagamu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/42a9ed020b3f98fa10f91e77024c5f16/67207037977.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/abfdac9f4865ad70a194edb6d42c41b8/11547498343.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/55704203167.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611936b8eb0d5---50119976324.pdfIn PDF document text
    • https://www.crqp.ch/ck/ckfinder/userfiles/files/toneb.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fe498c926---farigabuwonemibo.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/37076478623.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/21960567781.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/46377889814.pdfIn PDF document text
    • http://imaginove.eu/data/Files/56320813403.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/99498479234.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/62825cf0ab8408da9da4c24a7ff84919/75768230650.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/d7h1uqq28ikkmomihps4irqo94/wukejowipuritigexasirada.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/75419533178.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/7il91t18gkaj2i1kt6uiemtubc/18405471705.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/kq1t5du9f73flg18lm87ame531/rugedexutagobobadilo.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/77108033201.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/24423422584.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/vidijurapukerufigovuvesug.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/83519950005.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/zapemubewozemarunikuwalo.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_off0000dcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 17804 bytes
SHA-256: a11c868110981da241d572442d44bbf9383241eac6ee0b0fc32edb1cbccd4e51
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 10576 bytes
SHA-256: 178e63f1372adc9631b0f6ba455cc4b7ff39ebb9db999cd0028d33c042cab5db

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