Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af5770864e3d9d2…

MALICIOUS

PDF

72.5 KB Created: 2021-09-18 20:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d2570e6b76ff0093ea80c2b0a784437 SHA-1: 54f9a530a4d8f155c8eb54a1bdfc625e886f59d7 SHA-256: 4af5770864e3d9d297f799b7c53c7680d16fa14d5d8c2ac584a0d56fd13fcd1e
196 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URLs pointing to potentially compromised or disposable domains. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be intended to trick users into believing they need a password for an archive, a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=bible+quotes+wallpaper+for+android PDF link annotation
    • https://marcuspietrek.de/MARCUS/files/file/dupijagi.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/88834400588.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/roriwumuwireke.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/mutafudoxepepuluforol.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81164886089.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/kofomibukokus.pdfIn PDF document text
    • http://chikatere.com/Upload/files/7924702110.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/wuwevekojivot.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/33908114991.pdfIn PDF document text
    • https://senfina.top/uploads/files/77280053965.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/62528799173.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/jukufaxikaripalovewikajo.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/85636809890.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/97766487372.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e4fa50ab---fisigoli.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144682ec45dd---256221.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3dc808b6f---47908211603.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/vinazozepipumabunexi.pdfIn PDF document text
    • https://morabia.fi/images/file/zipenopawuxitup.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/sovutipi.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16145878a72420---87771723229.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321728d2ffb---wejetafisu.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/21525319874.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/7329837349.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_off0000b7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7EB 11016 bytes
SHA-256: 8d280f54f09b0ae7ae672d1f95b5d0ce7dd118090812ffeade5a8afc195329ed
font_01_sfnt_off0000d14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 16760 bytes
SHA-256: 914d520783d9697af45e481b642093e07180ceae5e4a4ff634d1f390a5b602bb

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