Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb03eae271e6cf3e…

MALICIOUS

PDF

98.1 KB Created: 2021-09-06 18:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51c8b09b2095ef63975b880e10e79f27 SHA-1: 703a763d4525f2b09c12305e590f12e25abc664e SHA-256: cb03eae271e6cf3eaec849b9be33b7046ae9375b6ddcb644559be23e1922a22e
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. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The file's structure and embedded links indicate it is designed to redirect users to potentially malicious external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=hermeneutik+heidegger+pdf PDF link annotation
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/72lt4r38e8vjjcfn8d724kc572/31509930484.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ce1e759c---77036270422.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/eace69d40875e5add73d1ddd9a8a3d45/79660064143.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c940f2ae041de13e6a69e71973566f2/tedetisudedetenijofonize.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/kiritafigowipijezetuge.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/98659201266.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/c7323f4ac15d936ea180b725328f1247/kezegapejajudobutisile.pdfIn PDF document text
    • http://suapaiatuipelehakefamily.com/clients/80707/File/kakijikig.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607482a40ea44---6552826627.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/jefiwoxijemupubagusexajev.pdfIn PDF document text
    • https://actorconseil.com/files/file/gaxafumopazijulizosegarik.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/kagijodopatuniwamudepes.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/c6905c9b3326a3f84dd084c0522f4844/91706752867.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/83432324180.pdfIn PDF document text
    • http://arablift.net/userfiles/file/50232550206.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/14598629714.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/pavunubidukizalunafigu.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/f7a72c4f46e251773e240366f46efe7b/mofezodobawu.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/tonojoguvebiluzudotira.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57d51e1b41---wuvejolilalewosaborefa.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/8097605569.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_off0001175f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175F 20868 bytes
SHA-256: 45cbb3d256578c9547309ae189ac2175a28852194d2cf792b2ee3bfb2bf91f2e
font_01_sfnt_off00014b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16332 10632 bytes
SHA-256: a8a8439ea2f75482f40e62b90d6033027c759de3ac337f0d9a95c999b0df433a

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