Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23c3177a744e3c6…

MALICIOUS

PDF

97.1 KB Created: 2021-09-13 14:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1eb6d9657c193885b60e1263e30fae80 SHA-1: b861a6607312c80c5c16847d1394646b8e7e8d0c SHA-256: c23c3177a744e3c630037aa848bde905cda22370a1bda50b670a7a88a057fd75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to compromised WordPress sites, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://ketchas.ru/uplcv?utm_term=thinner+leaner+stronger+pdf+free+download PDF link annotation
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2321d958b---85404521910.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/7723266148.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/97224195155.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/mupoboxilixogebavasovi.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/24767625936.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/sebolazadomumikofalinano.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/nufasowetutidowi.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/dapapulujevorizafakuwitu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161360eeb1da77---90974344611.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/kugosexipuwedusu.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/bamigudijelilogeweguvobe.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/41602369851.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/97514761311.pdfIn PDF document text
    • http://boldogelet.hu/media/nibosutukapavibuwulen.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/fafamoluvapejor.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613d19f9cf82a---68002685336.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/33650302981.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ec87b922---norix.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5e9cff9c849a7e09403110f1e550f4fa/segik.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/63627353792.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/24876447687.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/36563493760.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/33582024327.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/wafarekirebi.pdfIn PDF document text
    • https://tckontrola.hr/files/jewarulexaxuritizura.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/42095267537.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11289 19404 bytes
SHA-256: 349db827b0f2092865a3dd43847e7ddf8fd3f9e06d5c96b7ebf2ec94f08e075d
font_01_sfnt_off000145f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E0B 10828 bytes
SHA-256: 5ced0d9ee9a57ffaa29a677f646dd82460cd9ec057710df0913a03283b913a5c

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