Malicious PDF — malware analysis report

Static analysis result for SHA-256 9215702f6a626654…

MALICIOUS

PDF

81.6 KB Created: 2021-09-20 08:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e16ead5ccdb4ab54f95bb01f22bbde86 SHA-1: dfde4736e4c789bf1248945b6459239dbad6b9b7 SHA-256: 9215702f6a626654359c3fe0ca1e80a9c922ec979d9113a7ef7764971ed53ea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm for phishing or malware distribution. The presence of 'utm_term=gta+5+download+apk+with+obb' in one URL indicates a lure for potentially malicious software downloads. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://ydchem.cn/filespath/files/20210914175255.pdf In PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/37677201866.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/96984436660.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/fidinovupogilakovesibotav.pdfIn PDF document text
    • http://fabrikando.com/cmsimple/images/file/27410018172.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/49037614902.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/98440696940.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/35464170603.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/xerudet.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e39a2569e4---61547334412.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/87487778105.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/ropewapomajedisugosuko.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/remalisulexotabupijo.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/juzoz.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0cf6db8141cfa124ff8bb0477f6772e1/pukuxafuzodotumaz.pdfIn PDF document text
    • http://keyday.ru/files/files/kubijapovan.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/c8704b7a71c73e35d5efbb87d7112d72/nixulesusevelosanijek.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/ritos.pdfIn PDF document text
    • http://space-edge.com/upload/files/kojowenadibenilibabemotug.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/kijibusivumufowav.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/22181233755.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/88871295673.pdfIn PDF document text
    • http://taxfreepoint.com/file/fesimufipozelemugar.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/98329576892.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/161386a02493cc---giboligatozodoxakaw.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/54408488631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gta+5+download+apk+with+obbPDF 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_off0000daed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 10580 bytes
SHA-256: eb3734c93f8d5068c765f6139bf58d544bceaf19e68c99d7644f6225924d256a
font_02_sfnt_off00010aeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEB 17392 bytes
SHA-256: 0ddcd17d9a25a44b6c74e2cfc968c9f7f1810f5f3b4ffc7e69b9291b891e69e4

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