Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42ede49fee5b768…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 04:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8162ac1503b502db62dba61aa68ced87 SHA-1: 6e6656baaed86f168a1c1648536dec8e0c1ae0f4 SHA-256: d42ede49fee5b768e0206071ea5761fdd7484c05396aca7f1a29b727f396485f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://archism.ru/uplcv?utm_term=noise+reduction+techniques+in+electronic+systems+henry+w.+ott+pdf PDF link annotation
    • http://kasintorn.com/images/upload/files/xikifumiv.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0db0cf6ac---bovewitefatodek.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/7d4580ea4b244fd4c4ec3c532f93ad43/10829729575.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/sejakirovejudisibax.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/35239458103.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/fijopagaripi.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/gogesifiriralebafa.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/30459286707.pdfIn PDF document text
    • http://aurora-c.jp/files/files/67556671155.pdfIn PDF document text
    • https://ikima.fr/uploads/file/ruzikitolawebixevesajeto.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/9367110675.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991a97b5b47---werukexovowomi.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/p599qbtlnohbff3l04d71effhi/41999121579.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611cd68fd718e---79471736879.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/18981674090.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708b515b1dd---buvamomifomiravawag.pdfIn PDF document text
    • http://sport-way.ru/img/file/882025396.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/dezasimedabaxo.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202108170254173151.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/29787205607.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/tuwizudulegubosofatinomo.pdfIn PDF document text
    • http://kelvista.lt/images/files/joguwisigijekak.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/5217604748.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afd0ceb18eb---niludidifimumet.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/71861536838.pdfIn PDF document text
    • 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_off0000d855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 11212 bytes
SHA-256: ff6f9ae059a4c174fc55b5a5bd906780151b3d0403b60ed70ca4b67e2ea29b39
font_02_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 17800 bytes
SHA-256: 43b62fcc15093fed0de15ef583081e909d807360ad10c374227e96348c9011c0

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