Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e72ec81608e0a39…

MALICIOUS

PDF

88.7 KB Created: 2021-09-05 19:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0facef24987a9c805cfe089e4c2ca6b7 SHA-1: fc923a59a7a91935f0d339abfa37faa384f3d6e6 SHA-256: 4e72ec81608e0a3996d192fd12058e52f98e5f7ea726169a3c812d7d65585a71
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or link farm attack. The primary purpose appears to be directing users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=resist%C3%AAncia+el%C3%A9trica+e+resistividade+pdf PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/76957661374.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/39231068030.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/18f67ecef72cda03a75467452a09fc02/12278225865.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/997a86484a474239101ac78b8ccf0600/buguxiwelimejitupu.pdfIn PDF document text
    • https://campermagazine.tv/public/file/25284303565.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/7868403652.pdfIn PDF document text
    • https://service-panev.com/userfiles/40622508034.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba6a2d187---91567908363.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/40032863646.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/fowogamedapitifudukopo.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/dozilitotomewivibeto.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/61a194e1b8569db29411ac923c5be47f/49315648796.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/53eb88e46d7a84d16c998ecdadf5e845/72481098240.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fc12df85c---1095514017.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/tukezezuvazowuvevove.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/nebiselipatugutorusetami.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161183c66b9e9f---botilovobogijukoribiguxa.pdfIn PDF document text
    • https://actorconseil.com/files/file/fulewokuvirilitenupafu.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/32968457405.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052407173773.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/dumetomogekaregugefewigej.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a163a171299---18612921575.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/kahskucup2lcvb5j371mlfo787/48834269678.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b47a4eabf---basawu.pdfIn PDF document text
    • https://mclarenquartz.in/ci/userfiles/files/lekabujapevopev.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_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 20340 bytes
SHA-256: d954858b69a10c5a0f3fb05ab4c74a78e5f38eba5c4d6441f1d0fd86dc4ebfc3
font_01_sfnt_off0001220b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A22 10920 bytes
SHA-256: 14a83c5503d966d948edf361f94b7e01149c30c552bc5649f833f140a04504f9

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