Malicious PDF — malware analysis report

Static analysis result for SHA-256 41923c373fd7d61c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-08 07:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7e80d5ebbd5e52cbe5ea7a1c004b3e7 SHA-1: d0e381e77be916fdccabad471796b3b7fdb3731c SHA-256: 41923c373fd7d61c893c800e8924846b6fe540dac6730803cfcc6d677315377a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The heuristics indicate the PDF acts as a link farm, likely to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=essentials+of+robust+control+pdf PDF link annotation
    • http://www.tecnobor.com/ckfinder/userfiles/files/jepijol.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/kevebatazurusixezig.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/mokimenavorikepogope.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/wadofa.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b65680779e9---banabesozizimidegebabe.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/9808151292.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/nazupesosedibolav.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210616084126.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/tesawulew.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/penusuzewupirafemojirozux.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/89334709151.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161275198c7188---7336559894.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/9l4poje3le40jn48th2jlqfvt5/41142754002.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/61017769236.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/u324ee3spnlrfh24s5omlqsh8h/jobarigisanokedizevosif.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/0d8fe13d041f46a8d93aa208bddfa800/xinasiwulopaderelipij.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/77002265032.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db2c2cad245---37875786037.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/zudagividunexesonezolam.pdfIn PDF document text
    • https://tisuputih.com/contents//files/31797767988.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/4090b6ba2a0bcd66842aee6e9c977a75/rotetimumizefe.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/19889535956.pdfIn PDF document text
    • http://dalaichau.com/files/60564812378.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210612_185043.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 19320 bytes
SHA-256: c0364a53f2d6ea138cf08d32cbab1f7733147141b5af12f0c41ac35f3a5f9033
font_01_sfnt_off00011914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001312b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312B 10836 bytes
SHA-256: 5127129e73137050739aa40c67c2aa3fc6e83c6f606430e55c83ba7df5a1b9ed

Open this report in the interactive analyzer, or submit your own file for analysis.