Malicious PDF — malware analysis report

Static analysis result for SHA-256 b979036bfab2f75d…

MALICIOUS

PDF

84.5 KB Created: 2021-09-16 20:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9532cef4aef4dda3ec2529357a055957 SHA-1: fd13b9b000c041b530f853a50ec14262976d464f SHA-256: b979036bfab2f75d8add9e1866230cf915401c9e4eefa6e3bf1a4148c1166bcf
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript could be used to exploit PDF vulnerabilities or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=cxx+compiler+apk PDF link annotation
    • http://nhakhoauytinhaiphong.com/upload/files/namosadazonudamufomoriz.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/43528017407.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/duvabikalurive.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/gukagefidadotepum.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/nobemu.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/28213849732.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/72325847193.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/bajalogetorapurabatowuv.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/14016118468.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/35396153857.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210906140052.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c0ca8862b---veturefunob.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/nipexobijirubepefotu.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/43454609697.pdfIn PDF document text
    • http://one9five.com/userfiles/files/vabejemonif.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/5948057215.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ubbdtuae8bvsluued4m3fcfj70/rekuketedewudasomotubasib.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/30568596451.pdfIn PDF document text
    • https://dptech.vn/uploads/files/magexukemetetud.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/56690737594.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b453edb11f---97187224488.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc7ccbd5a6---nopiguwoxowokexarikoguko.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/92018032074.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/25322324484.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161301ba7dbb1d---bagukazafobugadepitiwokap.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/35621175413.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_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 18008 bytes
SHA-256: be82e0bbc36beb66bc433b0f809375013b277a4ee1ce751d0fb680e553d5824c
font_01_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 10392 bytes
SHA-256: 50a4e659f159644313a88fb8fdf74c307ab3386ac718d2ea162d75b388ec6013
font_02_sfnt_off00012c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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