Malicious PDF — malware analysis report

Static analysis result for SHA-256 898bbc9ac9e37dee…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 17:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d4d80718a36978c64ee42e57d1ffd5b SHA-1: bfad76e44d837d79c1ee4058e17192d7ae3cc9c7 SHA-256: 898bbc9ac9e37deed10bc2950543bfa8199f146ef12c559b189a88fe59fa7bba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics strongly suggest this PDF is used to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/uplcv?utm_term=keurig+cappuccino+maker+manual PDF link annotation
    • http://jiuxingchaoshi.com/uploads/file/302235195388.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/depajezivilosetabafema.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e7595a9a5---jikov.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/94674716540.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f858598d56---lixuneromoxor.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/2a6012e2dffb343b4cf7ba874474ef54/vobonowowuwiwopafugaj.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/1850236661.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/h06okuvfe0m2dh53eeo13mlbje/49514106357.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/t3gehka0qs3i8ibj2ipln2bun1/goxekiwa.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/73792910492.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/56073757324.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609573f5e45b5---xasutozanitab.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210626030020.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2205b3c90dc5a8cd552a772ecf410af1/sanebipomazemotefa.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/f4fd767d0b0f8bf2356cbc58739e7c98/2786935586.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/57159761977.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/63344368911.pdfIn PDF document text
    • https://maturana.cl/upload/file/vonafodikutikonogibo.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/pibowibusok.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ca3fd9787---43678321972.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/viselixumumosekafixosafaj.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/joxun.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/46434d92e060f9637d2538265b35cae8/95387002618.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/11945753327.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_off0000d25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25A 10636 bytes
SHA-256: a70ab7ffff942ab0db516224b04de65abd865b50f0fe222f8ce08acfeef08d71
font_01_sfnt_off0000ea97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA97 16712 bytes
SHA-256: a24e4531e8f3276475e213b790be82c36e9c3cd8f41c63da2140944bc868e58e
font_02_sfnt_off00011575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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