Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fbc9c07d961af8…

MALICIOUS

PDF

82.0 KB Created: 2021-06-27 11:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 95c667ec6cdf417f4cd36f11561c6753 SHA-1: b4e5bfe88765406323fe901b8f7cf97e1dffa6e9 SHA-256: 71fbc9c07d961af8aa4ae2d972aaea8de31656bf40bbc81fc05071100a860fb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9719

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://botosani.ro/img/uploads/file/50192785967.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ruff8udtrpplqaoh670korrbs5/nekitubaniwinibesipi.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/91537547893.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/4d63455fb2de4727f4763ac4a0c38403/fatugurobixomatiremasu.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/memuzopajuwikuxibojezes.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160915c31351f9---72228451661.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/zitig.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/zaporupukujepakez.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b20ceda34e0---fogalonokebobilu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4475a964c---latokojubasozujovixiwige.pdfIn PDF document text
    • http://planetamama.ru/files/file/rowukojotaw.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///josis.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4c8fc086585dc0d67b4cfa0d2b9ec019/16259766380.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/fugix.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e56fdbb6a9---54914696360.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/31213156455be608110e0a40c4ac3a14/86943955894.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/81075c1133d024ced123551462c53495/99229980782.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd6fc3c04d---97807424526.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/69397590283.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3a217ca4e---kobokutow.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/tafev.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079016b1a908---51816046806.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2debc90b---56479767863.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c5692330de0e3d0349115c42e695c19d/bawirexoxukiwete.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/jovomifeposijikujuxuto.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba2a8be11a---losapalasukefikosi.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/parenag.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/b6a077e216833c77660ddfb4351fc1d3/26716258410.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=s+chand+biology+class+10+book+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF64 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_02_sfnt_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 11000 bytes
SHA-256: bf05c57daf7481e887fb770b05cda54d28f67a7a8427c524b9b14066dc27f855
font_03_sfnt_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 16508 bytes
SHA-256: 94fbe65fda20d099bedd921df0872d69127ddcb1517d2c89fdef814b8ec7850e

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