Malicious PDF — malware analysis report

Static analysis result for SHA-256 1886bf3aff1ca394…

MALICIOUS

PDF

97.1 KB Created: 2021-06-25 21:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1a6f191b06654059a9d8c63829f61b77 SHA-1: 41909f0a50b88a94cdb50537d9f48d400fa6e041 SHA-256: 1886bf3aff1ca3947d9885266c10e39ab07e4adff696787f9393c56521eb4919
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://timebank.ru/sites/default/files/photos/pagefile/nemoxonefetofopozixemaguf.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16081d94b9682c---27296479292.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/radowuk.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/6531991777.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/38517352991.pdfIn PDF document text
    • http://gdgom.com/upload/file/210615235236352718rmky34kk4456.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d29ac02f590---foporiwiv.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ssaq4vfe3as6rnjep0pp406jlj/kesokilikanonezoruweva.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/72fd8588587f0c051fe88dcc323267d4/riruriri.pdfIn PDF document text
    • http://huiking.cn/uploads/file/072003186450.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/825df83c1fc9beb580010cc6e7cb5ce1/14131153031.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/04c1507548f624a29bbc7809a19e455b/tidadarifedalafejo.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/pefeze.pdfIn PDF document text
    • https://amblamy.ee/upload/file/buxexalidevufejifevuzara.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/36126728713.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/zekakovetajekalapolof.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/bogazebiwunoxupi.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f07f591f07---likovopovozarod.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/ffc0c7a969c6e047dde25461a0f302c1/tafepakenalirasudali.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/69805138997.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/zadokedifazokojofi.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/0hjcvb3ous5p2mdl1nsksp2e00/51289779125.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe4832a000---dekawinemi.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/344f1c233ce75a8795c8a0b5c48377e9/wezikulifoxuponifile.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/bumarenul.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e466d66a37---46161077230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=to+build+a+home+musicPDF 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_off000119e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E7 10536 bytes
SHA-256: 61f412d5b20624e2ae2ba88dd4a630420bc0c6cfa910c03f3a2ad07e84014007
font_01_sfnt_off000131df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F1 16876 bytes
SHA-256: dded5d7581d91466b5b985854beb056107af4489229dd8df685d989c511468bd