Malicious PDF — malware analysis report

Static analysis result for SHA-256 de408f46561298ca…

MALICIOUS

PDF

69.3 KB Created: 2021-09-01 15:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fedaa90607a11f937a28c82fa8ce1ca7 SHA-1: c83f8eff9cce6fef45b6552e04536dd2ca1812dc SHA-256: de408f46561298ca8bd01793feffa49b5cd88ba118d0850d1e2bf9561b7d072d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to create a deceptive web presence. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=anesthesia+for+dental+procedures PDF link annotation
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b5880866e80---novonexulolunutolujobere.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/70412703553.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/36935488988.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/0957e07e62ebf2548e02e04ec94f0ebb/mugixur.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/51116121685.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/mafivigevigenoza.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210715_C0F1DDF1C8AA21B7.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/r9s7qheg10a2rb0hnjcpmp6ch7/doxefutiz.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/katunibifuxejenimubajip.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/gazarirawuvewale.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/13969420356.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vst1dii6u0bam8g2pkvdprpv22/19900025685.pdfIn PDF document text
    • https://puntoagricoltura.it/file/jeduzo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079af037a697---63219071609.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0d753a1b---47408856215.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/61afdce0071c6844e955390dd2adac37/pixarofusufodebi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/mk9n9o68fbttcr14fuook9oelr/52504969277.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/4732852834.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/firefekanu.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/fobeper.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68047dcbb8---zeluw.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd46dc7563---pofitidafumudawelago.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd863f37d8---51300409528.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_off0000b221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA38 10800 bytes
SHA-256: f2cb6d074819836d90ba2c4b2283b4ddfa5eeffe25e973b0f68c5ecc6696de61
font_02_sfnt_off0000e30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30F 14732 bytes
SHA-256: 9f6b061d66ad6e44068a2351e9100d91964148e799bb043e2ef2a9466483c7df

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