Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bec41332f278196…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 04:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 54d5349e93322e7b397b2ed08000a87b SHA-1: 324c35e41690f1f0676dff0748f2ed3a6dc347b9 SHA-256: 0bec41332f2781966c7f398819e55e5e8c9a555c504640281a478202c93b6df1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. It also features numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/09e5b1692bafefa1aa3271f6ca663e08/jovigik.pdf In PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/sagonigalujuzigopo.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/924c23c78bce4be52c204885ccb91067/vorigapubezop.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/rilexavazederibis.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3728c089a---37211264719.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc2c0c869aa---80759822684.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/zawerovonutijamuxufilix.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/noruzoxasubufaberame.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/68794594965.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160773f13de67c---koxako.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161353e26360a7---28320996525.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/silafovetulazewewida.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/652bc49d3455f562ecb3fb1305576eaf/titetagevaguxin.pdfIn PDF document text
    • http://belhavenhighschoolalumni.com/clients/13962/File/tazafamevodetizesojebi.pdfIn PDF document text
    • http://mobiliteit.nu/files/tojawudug.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160940cb69031e---notibu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c01633533---nimakaliraji.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/13583268889.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/21n7s8hluo8bhvf9g6ikfcjhsu/29648056856.pdfIn PDF document text
    • http://traiteurluc.com/userfiles/file/5594312892.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607acabf5b5c2---2955023947.pdfIn PDF document text
    • http://crm333.com/documentos/file/74479936843.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/jorisikelupewoxoxatus.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/bhmkim2i143c85ke5cdp87u6rc/womilokekumujagenida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=humidifiers+and+dehumidifiers+pdfPDF link annotation
    • 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_off0000d98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98F 18032 bytes
SHA-256: 1f2a580a0a27516201f408220ee6ae31939ddbfe7d3a731e24861ce814a60ad3
font_01_sfnt_off00010829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 10588 bytes
SHA-256: f36808cde7d0b0c1fc2dd56376df394a5a2be2f009268f1576e9c5d8944b7431

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