Malicious PDF — malware analysis report

Static analysis result for SHA-256 077866cf6939bd79…

MALICIOUS

PDF

86.3 KB Created: 2021-09-02 22:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ccc3548f140c55ac2ab2a3db586814d1 SHA-1: 2ae80a221969eac64ea56cb4c71706e375182a44 SHA-256: 077866cf6939bd7920ec1022ef636dc35496f92f4714ab6b2fdb950b672cf354
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://samnakthodrahassob.com/userfiles/file/kududokeruda.pdf In PDF document text
    • http://www.zywawiara.pl/pliki/28014694032.pdfIn PDF document text
    • http://topliving.sk/userfiles/file/xupimupadubisodomatoj.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b1a67b466fdbfcf09123d13eeb5e2d0a/rutaf.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/77532240544.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/18049123398.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/pebapemakapubuzeranove.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf8a088f1e---25141753462.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/40263338144.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b72bd9e8c2---20453700279.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/47063426859.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e0824efb1---kisuline.pdfIn PDF document text
    • http://kuppersbusch-center.ru/uploads/files/36345373572.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/41cc9416e49914caafa19b1a85505c1a/33890758862.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///47984128555.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/787cf8hngvqv7tckf4u1v2jij1/jesofuwa.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/92871271710.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/bunekesewudelapix.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d77929dbf---40548856161.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/44558118612.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a59a62a2c21---73824870551.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/2008638788.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/cc2a9860d20d73d2a797df036831adb5/voxefosowaferapuvijofal.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41ac42327a---valozoberoruxul.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ecc55a7fbd2---fedemabalap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cell+cycle+mitosis+and+cytokinesis+worksheetPDF 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_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 18388 bytes
SHA-256: 701aa822f2dd515936768a47dc33ac21c7afb18418a0c7c4bb47d98b26a3a537
font_01_sfnt_off00011a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A12 10956 bytes
SHA-256: 3a04dfae10098ce8cbdd1a8f534641ca75cac933ab07868dc790686bf8ad991a
font_02_sfnt_off00013369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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