Malicious PDF — malware analysis report

Static analysis result for SHA-256 df797098f102e119…

MALICIOUS

PDF

98.8 KB Created: 2021-09-09 03:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0cb8e5211ab5c66bab14b866f2265912 SHA-1: bd3596ba4301d0aa405bdfe6449af85c223f40f4 SHA-256: df797098f102e1194e48526150b97920c0d5f5cc387c65b7e88a6d69c9f6ab85
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the numerous external links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=molecular+biology+of+the+cell+pdf+free PDF link annotation
    • https://winpoasia.com/ckfinder/userfiles/files/koditapitutadidokeri.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/65090387822.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/jilukiluvudurinakupiza.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/1isagbs0r435r0dnvpftcgbj63/surimowamolatapiw.pdfIn PDF document text
    • http://fteq.ru/files/file/37282195151.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/girobugegavipiwekevejimo.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/17009858961.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/15158382681.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/kodajefisup.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/92f82419e3fb334a7f877e012e79dd08/1862266575.pdfIn PDF document text
    • http://allycatering.com/userfiles/95107206337.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/lizuxuragusegowugolimi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613182b460a6e---tolusar.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/tiragigulez.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/pibapigulelojot.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7af0bf346248e16569943cca6911d541/82865303429.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/pixudifer.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161315a967fca8---30971848514.pdfIn PDF document text
    • http://araonline.hu/uploads/file/96641724636.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/rekifubuzobofavanekek.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130714fe26c2---57936022433.pdfIn PDF document text
    • https://datawire.gr/files/files/mapirojoler.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/lezixufivudina.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_off000119e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000131fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FD 10972 bytes
SHA-256: d4c5661b2e17da35e3dc8a98a12bcab91634ca3aab88ca0e89b8ef84fe465add
font_02_sfnt_off00014b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B2B 19096 bytes
SHA-256: 0d08ee2a31c31a07cec916b69d9c22b1646930ba0c213ba4d5b4b3d09ce4b151

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