Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8a41ea837d72fb…

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 20:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6e6f44bb4b7a8b03106a6061d56d704f SHA-1: 0712552c21a0109e282a46cdf235b4a64d4e678d SHA-256: 6c8a41ea837d72fb9a218088d286fee0c2ae5b2a4f4d180b10daf2c9eb76fd2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=que+es+el+bullying+psicologico+pdf PDF link annotation
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb5b41af3---zefatekopezotaxod.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///38915489152.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b04cc01ec2d---gojuwixiwirosodavu.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/30158922903.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/a99904295c27aec23b92ed9fdeca8a0b/8464329936.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/wapobuge.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/kijufemuwelapepuzuwamado.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/11907699711.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/25053765244.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/xekepasubezulu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f7b18ee7a---gedogudiruluwefojenazarad.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/lavawigukubotidatat.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/50794092923.pdfIn PDF document text
    • http://gtshotel.it/images/file/45110029755.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6e62cd4a292c830dcab2a5e8e6518787/13552629333.pdfIn PDF document text
    • http://minerva-collection.net/files/files/rozifotidiratuginumek.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/14664588441.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/55298206050.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d3c4303a4---53553776974.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/guwefasir.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a663404015e971ff670ed7dafd0371a3/53596969848.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/54763513826.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c277050ea6d---lovoparipavizuzobagupov.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/hg78h1iehhl73kk8qd3pr0p0op/febubis.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e1bbfd6b0fa---96955077389.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_off0000b6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B0 15092 bytes
SHA-256: 6b9cb4c56652f010f314630893cd7d08f5c8c15cfb4f874a655caf4efd43b9ce
font_01_sfnt_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 10848 bytes
SHA-256: 4cb1a72f74a87d3ec36ea02c8a65abe301a25fd02607e2ef9fc0cea9f5dcbcfb

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