Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4309eb6d6eea2ac…

MALICIOUS

PDF

90.5 KB Created: 2021-09-06 09:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 834e03b4d3f4f32b3ef61d75a9e0f2ef SHA-1: 5aef79c288fe68555a8c57ded72146ec61e32fe7 SHA-256: c4309eb6d6eea2acc416c99b791454976f0e67660929bca46576b70bd81bb4f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains or compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://korea-seals.com/ckfinder/userfiles/files/58428622906.pdf In PDF document text
    • http://nickels.design/ckfinder/userfiles/files/sokoraforifutenepo.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d78f93c995a---45896321834.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///13079343415.pdfIn PDF document text
    • http://jarosi.hu/files/file/tofofegozavoxibarurisata.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16079dea61b616---gabisovovomava.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/valub.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/xonobebevel.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45117cc13---92768006086.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c59b401b4---18861281650.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/tusidenukeme.pdfIn PDF document text
    • https://deepex.hu/hirek/files/roxebaboxalibati.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/61064636521.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf118d926b---88732468917.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/63349966690.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/gamewexumalejaxikerem.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/24008614019.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/ruxamigupe.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/lipodofonatekisu.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/40387702905.pdfIn PDF document text
    • https://castel.ro/userfiles/file/83791059744.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/8018697031.pdfIn PDF document text
    • http://scpt.it/userfiles/files/lonepaladodovupejuxul.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160bc40ae2f71b---xokebutagutakobitaxigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=medicaid+renewal+application+pdfPDF 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_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 18436 bytes
SHA-256: 03a1a1b88056a738efccdc46f3f1a673bb158dceb052e302b0c869a1b5b778ee
font_01_sfnt_off00012bec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEC 10524 bytes
SHA-256: 22e6ce82770abf80255df819d3b3ffcfe45c751453f7acedd0ceba33f9f1883a
font_02_sfnt_off00014407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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