Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1a9ed088d032b3…

MALICIOUS

PDF

88.1 KB Created: 2021-09-05 18:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fbe8007a069baccd91569602a76b4ea9 SHA-1: e461c5ea91792913510c034c9bfb222bd65c2a09 SHA-256: 3c1a9ed088d032b32d6519183dae651f187b8e14b21ff82f81f5b816b13967a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of a phishing campaign, likely attempting to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://nomylo.ru/uplcv?utm_term=biograf%C3%ADa+de+andres+bello+pdf PDF link annotation
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/64500a4365823d05525959a10ebf14cf/faboxaloxorodajepuva.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075579383028---lutowulorilunaruzuwis.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/nunadafedenaru.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160d67576567ba---75369350735.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740d7d2e4bf---22304143244.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/78341737987.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/82453934008.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/kebapisidorujumibemozija.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160972bbb5dfd5---rezetomuxebuxujato.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb846a75f88---67677675173.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/legaxujekebow.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7b1c204742---18070321394.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/nurisili.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/2bbe6c9597f198ffe4026094aea9d951/sirox.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/gowukoturareki.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/339388453.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/80515527c191b18431192ee9fbe07881/209185225.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/26042268335.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/1fea1c821cee7fa98c60569bc7870cf7/rofagogibizuba.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/42215669789.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/52299487300.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_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001053a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053A 20232 bytes
SHA-256: e5a28e7a124297427e5b11e4738bf232c0310d656ec415caee93e74cc5e83634
font_02_sfnt_off0001383e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383E 10828 bytes
SHA-256: 2bb7b8b0e1a3bc468108da502fb0808d85c0c8eb0864dc1acf423a21fdd4b53f

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