Malicious PDF — malware analysis report

Static analysis result for SHA-256 8422d379a39af94f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 00:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e742a04783ff23da0a0b234d3d70e6ff SHA-1: 7438cbc984d99129f0c71c1e9efb444f6a9d7e6e SHA-256: 8422d379a39af94ff12e3547a139372e204c275b3b337c45ff5717fb3526ed92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of a URL with 'gta+v+fake+apk+download' in the utm_term parameter strongly indicates a lure for users seeking pirated software, which is a common phishing tactic. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=gta+v+fake+apk+download PDF link annotation
    • http://marinapogon.pl/upload/file/belurog.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/87893997072.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/rapexenanatajiw.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/pudolakifeburigan.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/bekivikisuliwukuganepobiz.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/46152236336.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/75463406789.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fac9a516990c6b8f028a325fffe4e9e7/10638796283.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16144f9ccedf09---67823243008.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/welis.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a274c25447---68025418453.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/93596066258.pdfIn PDF document text
    • https://gadapavimenti.com/GadaFiles/file/vakaralareloma.pdfIn PDF document text
    • https://successalpha.team/upload/files/wununukalomojazasa.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/67972758950.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/kowarobiwap.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/genaworunojixetov.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/12017298020.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/54994152157.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/xafoponebameripidigapo.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/843990ebf23a509089dfd68a8499f437/1104552630.pdfIn PDF document text
    • https://kamarkosong.com/contents/files/pukol.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_off0000dcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 10412 bytes
SHA-256: 27787c98caf8c06dda5d49cb07a489ed9b12c1553ff71b0aab0b955c52ff736e
font_02_sfnt_off00010cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD9 17520 bytes
SHA-256: 6a38c264685c435cc3280c6b3f458b0c9c63312933e2e3546b3a72945e01bb56

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