Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9616b2d4451b8c…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 00:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9d8d69539b78db0e76c0fc8b3f4032e1 SHA-1: 47f2a183ef7ca8df3f9696a7e7b0aa6f642eda8f SHA-256: 6b9616b2d4451b8c53eabb9d80ba938658d6a752e8324f6a6cb08f53794776b9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, including those hosted on compromised CMS uploads and disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is a phishing or trojan delivery mechanism, likely exploiting vulnerabilities or tricking users into downloading further malware. The presence of a download button lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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.
  • 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.
  • 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://garglob.ru/uplcv?utm_term=glenn+doman+books+pdf+free+download PDF link annotation
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/bc1d0223d227196fbab25d60d864c0e9/54408039104.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/98487860973.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/asukfkk8elrmd6ngr8dt34b074/makisamaredorape.pdfIn PDF document text
    • https://wecareprogram.org/images/file/jodedovelemabux.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/zabikulewu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca94ae9902---wozopala.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/vejatew.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/sivasewibadigidezinamido.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161387a6438e2c---50872547214.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/puniguzezip.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/jesekigasuvagane.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2214c96154a7897591faab1207d276ce/fuwozepewisetelomo.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/25020364402.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8fcd5e3eccd78e9ea7cba3f2dabad81d/jadawezoxika.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/koduxajafagoliboxigusuri.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e164049be76e54788189b52d71e1ab66/37188021706.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/7973883001.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/damodivuparedusi.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_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF4 10824 bytes
SHA-256: fa06f2ccdcc3ade23e0ed6574abc57a255b23e2e0bd925f8c7797efd4583c2c2
font_02_sfnt_off000113c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 17992 bytes
SHA-256: 29828307040ce7f83f9b106c3c3bc578a38634817a0824e5ffd6f834fccfa47a

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