Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a01ecbfa11e5e5…

MALICIOUS

PDF

97.4 KB Created: 2021-09-02 06:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e012bff941ba08c7e9e5ee3e9db280c0 SHA-1: c9598f56ab25598f1ed8efcd3995005bc9585034 SHA-256: 42a01ecbfa11e5e5b64bc3b5fcb7cc3431f56dd52900ad3022a02e95a63334d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to phishing pages or download further malware. The presence of multiple external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b0e203271---70231343484.pdf In PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/75457ea5eebb3a1e85172471fae9b804/99929209026.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb0252b3be---mowijulezojupasufet.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/resas.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/xugavukav.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b96ea8dcf---39308044019.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1051829ff8---taxerowixopofigino.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/75370671373.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/7f2f64fa96275b47a4c5f3500de8f943/66731878315.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/2791bedb794d335e576914fa72cc5620/29093914651.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/dofav.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/jarufozoxonukepeb.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb21d4b3cb---lumopisevegoj.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/zofatamuxekiverav.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/87701927987.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/2616974cccee6ab2e91d6bbb2129baca/tenagojaviwizegalejigo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8ce3babc81badf7c5bb53ee3ea1ce96c/kovunibewafamemumafuba.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/raruduvamuxotavekamajema.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/nijatuwo.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88bac8dde0---wupadafarodoxitifal.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/38730600291.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/kiwelazar.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c971b7218ec---72630392321.pdfIn PDF document text
    • http://tylincms.com/userfiles/files/kepixakunawesapekuvefavi.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe25104ad3d---tarugitinowej.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/35768577071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=illustrator+playing+card+templatePDF 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_off00011322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11322 11020 bytes
SHA-256: 87764329b5b7b04ec6f1a7ec81b632dc542472d8eb8e90ab9218b7682bcb5509
font_01_sfnt_off00012c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C93 18928 bytes
SHA-256: dd0af1e29b8ebd205db2fab3284ab02401772eeda261a0a2c89072904ce9590e
font_02_sfnt_off00015ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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