Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9534f08fbd888ce…

MALICIOUS

PDF

86.3 KB Created: 2021-07-17 03:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c2fb1ecd5c0965fe3347caee8ef08e3c SHA-1: 3d999e1ed47b4c3250e9c9af2c2e7054d3b86333 SHA-256: f9534f08fbd888ce0a0fbb67d758f570ac282489ef770fdbc1db0bab49a2f617
196 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing lure impersonating Microsoft. It contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure, likely to obscure the true destination and evade detection. The primary goal appears to be credential harvesting through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=charles+dickens+and+christmas.
  • 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 http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e6680981a7e---17800185448.pdf In PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/sitetasanegogatuwuruj.pdfIn PDF document text
    • http://gtshotel.it/images/file/nejukato.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/banut.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b655d2cb94f---ratenodewuguvijuriduk.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/xapagadudupefut.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/xipisudazamatep.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/mapiligilefedeluwa.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/860fa49f74d2aadeaf75eb96d1a52f9a/98288748229.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609634a3b0604---bilonapubukobolenuberexa.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/vudotimedozo.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/74361582325.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ced194f5243c4749e053cbb625371d59/zobopusikago.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/saviwuvak.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b9f9fd533682bc8f15fd17e4c6576182/81912133143.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c896f8d86f8---rifodoba.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/87504680654.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/makanejasukenux.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/588a08d4cc43a5991feb683967001cc4/puvexokupibiv.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f22897ca2e---11552603681.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d08ea0b845---wosozulivozisogi.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/50360720962.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/xoxixudefebovabe.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/75167002062.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f87d050e43---78381106942.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/08d3f0a1fa9e88b0fa5149fcd62d0061/91937622079.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=charles+dickens+and+christmasPDF 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_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 17544 bytes
SHA-256: 34c858941d80b9ef032e23271048d136ec96830e82806512eb895a69af9b0be5
font_01_sfnt_off00011b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B75 10640 bytes
SHA-256: eda1e03b187547168307a0b1e4a9d064c3ca0ec1a75189c25a9ee1ebb61deed2
font_02_sfnt_off0001339c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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