Malicious PDF — malware analysis report

Static analysis result for SHA-256 343a9df5f1794279…

MALICIOUS

PDF

89.8 KB Created: 2021-09-12 00:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fad7f06cfbe273addc52671b11c145c3 SHA-1: 60a712bec09dec9c8c5905134fab1043cfccd5aa SHA-256: 343a9df5f1794279ee1f9de21e9b7f17df126c842d28566a515bb6583ee1a38a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic and ClamAV detection further supports a malicious classification. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing lure designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://olterus.net/contents/files/rabixubizalixisagufusa.pdf In PDF document text
    • http://fueandhair.com/userfiles/files/sixuriruwamog.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/safuwe.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/nipenejapa.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://qualitygums.com/userfiles/file/vogopuwajiwi.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/80619980322.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae4b7a4e4---jupelibojabez.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109011120129053.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/47112907191.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/88162636538.pdfIn PDF document text
    • http://lukinserv.hu/file/gadaloz.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/16433478307.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16137dcfa50498---63045760716.pdfIn PDF document text
    • http://someteme.com/archivos/_20210910024337.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/20884279944.pdfIn PDF document text
    • http://gdgom.com/upload/file/210906112238200159yt0uhnn09kpt.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348758a82ea---jaxigafis.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/86920153901.pdfIn PDF document text
    • http://acril.ru/ufiles/files/nakeworobedunazilivim.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/wupuzakuxat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=obb+file+for+gta+5PDF link annotation
    • 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_off0000fa07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA07 18200 bytes
SHA-256: f0ab8e331c23b5fd7cbd20c210799505ae733033e8d51651693a0ec2fb2e5996
font_01_sfnt_off000129ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129ED 10416 bytes
SHA-256: f8d01355fe1b694072dec55457b4370ea06300c63ff5b584745d86c105929bc4
font_02_sfnt_off000141b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1