Malicious PDF — malware analysis report

Static analysis result for SHA-256 992daf4ff66776f8…

MALICIOUS

PDF

98.9 KB Created: 2021-07-06 11:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b555c04ca55622c984f224257fc3f95 SHA-1: 8b3cf3b71a8f0779f6306d031e5ad9936c5a5ab7 SHA-256: 992daf4ff66776f84a09ee751a5c237bdff05dcec38c1e0e5547f52f3e3af733
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to malicious content, likely exploiting the user's trust in PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://allytemp.ru/uplcv?utm_term=according+to+the+formula+for+stopping+distance+from+60+mph
    • http://magogaralbamoble.com/galeria/files/52749181234.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0404c67b4---88084332070.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/39542768898.pdf
    • https://cristalensi.com/public/File/pozidexi.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/046f3b13cb3bf453081f181fdabb9f85/roweserobuwonobup.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864806764f8---zabodesafe.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/89588508218.pdf
    • http://guides2alpes.fr/uploads/file/60433661505.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097dd3f811e9---55548870635.pdf
    • https://wolfgang-photography.com/userfiles/files/xadisegelavujafivawukem.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c2f3704661c4aa2795c2bc3443cabbed/zukixiperodugigub.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4d2f15694---63242195832.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e706f64cf5---99231895574.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79qbc87n7e7qdhbpsttcap7fk4/56009607157.pdf
    • https://baoholaodong24.com/userfiles/file/20884130271.pdf
    • https://groupunsur4.com/contents//files/49499188051.pdf
    • https://africanresearchcenter.com/userfiles/file/24040097817.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ad1748592---85342686026.pdf
    • http://www.addvanceo.info/userfiles/files/12195622666.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/aknusvo13uk4grqf4tr8s4ttam/52266195810.pdf
    • http://alnadaoil.com/userfiles/file/37937324093.pdf
    • https://dijitalsanat.link/upload/files/67535134647.pdf
    • http://consulcongress.it/uploads/assets/file/terunetirexuxis.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607206adb2404---46939527309.pdf
    • http://hiddenforrest.net/clients/76790/File/pejepufe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011895.bin
dc3061289b52f31591317930331233c4ca7bff521425d2383d1753200eb2ed6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11895 18168 bytes
font_01_sfnt_off00014872.bin
ef5db799a88e2443a37b1bea747ca69e3f3755c5e73d7941dc08512ba6dab3e2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14872 11440 bytes
font_02_sfnt_off00016312.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16312 16792 bytes