Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c45dc0edadddb75…

MALICIOUS

PDF

92.8 KB Created: 2021-07-20 18:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80c618aa947a8d513bd1d12763a9cb9f SHA-1: 24dd2a9b7e730b63ee7e80fdc36266d92b79e22c SHA-256: 4c45dc0edadddb7515acc8f359e41442369d41f9464a16dec210fae716432425
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, aiming to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to facilitate the download of second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://thefertilizergranulator.com/d/files/nofividagikajuwitiso.pdf In PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f0272e9ab4a---xozibe.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/sumedepekuxopomuxolaga.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/zarilodepetimikatudul.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1c5f40ebc---53603457082.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210627190437155.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8246f0e5802da67df9583da52cb50f0e/95717428335.pdfIn PDF document text
    • http://wirheiraten.de/images/file/81812689565.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/82ab133be62d7e64a73dc3bc8ae7118f/34499882925.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/63807757942.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/xadulofuligesowotero.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/60365677931.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079d83f7928d---62345673994.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e24dc8777e5---folelewudus.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/munitomikejelefosujon.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/komofamosivomob.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cae38ed8ffd9c98adcafd6bc2b720d3e/tagoxabivar.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160736a020de1d---tovarevejaxomamanogumexek.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/75291101789.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa30f4118e---68897691084.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/xegenimakeniguputari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=oracle+interview+questions+and+answers+for+freshers+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_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 11140 bytes
SHA-256: 41e707635168bc3934436597cfb14248a0eaea192871b077472b940c0994536a
font_01_sfnt_off00012067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 17360 bytes
SHA-256: fc658589d010b32878a7934e6f4518157f3c3b39f0cc2b444e73aaf5a4782d79
font_02_sfnt_off00014ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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