Malicious PDF — malware analysis report

Static analysis result for SHA-256 e68f8aa9e6409699…

MALICIOUS

PDF

73.6 KB Created: 2021-09-02 00:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7f5e21c61a6f73600e165c30f743ef4 SHA-1: 3264ca33994b49329c64f609350125c69eb48556 SHA-256: e68f8aa9e6409699050701d130a8e474ec65139fdcf8e954bb2e49de13747521
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with multiple URLs pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure suggests a phishing or malware distribution lure, potentially using embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7355b7c8f---tosefiz.pdf In PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/th9hlnopmoa6cj7t04lhhsp3lv/44737735747.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ad2537d1eb---doleso.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/afcfa46758b650f4f546b169024d1c3f/fanabasidunebujigivel.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/dowilemofonalijamowumulen.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0b832e216606c6191eb3abd0a9714131/7081676289.pdfIn PDF document text
    • http://avatars.ru/userfiles/file/zuzefuzixedakixe.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/15c0bcc25b665bc526462ab4c63e49eb/38016341911.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/21904327095.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b312750cbb7---70265932448.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607895ee755e6---renovupovejosafunime.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/50131138037.pdfIn PDF document text
    • http://abnicum.com/files/file/mufuxotirozexesanidisino.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/deflltomsbnl6jnncqdhrq35b2/93373631057.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/retidowobaroruzif.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/vuxanikefitoxapisom.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/36929178380.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/maxuxaviwigogipobi.pdfIn PDF document text
    • https://alariel.be/userfiles/file/vofupakolem.pdfIn PDF document text
    • http://maciejabramowicz.pl/upload/files/file/rogowugidadenonano.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/sagivujulubuno.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/69c7877f4b382cea460f4e0dcdfecb8c/moxezu.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/kmpc3al548pr0qkf0c5dsk8p7k/jizazoperogaxitu.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/fuwafeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=dolland+and+aitchisonPDF 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_off0000c03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03B 16292 bytes
SHA-256: f855d00f1b08f5734c37720f0484f5d7c6153c3662df427255c3616ef8b626dd
font_01_sfnt_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001021a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021A 10236 bytes
SHA-256: 15a6f6869825caedaea6be241977235045f1e85488c60975518a1752a30e5f43

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