Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc7c66cb05ed335c…

MALICIOUS

PDF

110.9 KB Created: 2021-09-16 08:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c9e7c7bca72091315a9b1550ed47fd98 SHA-1: afd5239da3ebebd8c4f4cb0c3ddec1b3bf1b21f2 SHA-256: bc7c66cb05ed335c2a573433ada5f6ecca3bff99659ff82576e627c327bd0898
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=pokemon+mega+evolution+download PDF link annotation
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/mp98d695lhj696b1sa3l3mp0k1/14706171010.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/jutunumapedaneputus.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/detuduj.pdfIn PDF document text
    • http://hanleyresources.com/images/mafilokivofaliviwirilor.pdfIn PDF document text
    • https://lux-ride.com/home/u4-6pzgszajsb5u/www/lux-ride.com/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/18636048320.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/1916491625.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/kuxoretudufit.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/66181118537.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/siwusun.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/lolulonowowoz.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34283631425.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161310f14182d3---lamakipipakuzerolon.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/65335938748.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134557d1ade1---tarukedafevizafabimopirot.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/sidajobutamakawinow.pdfIn PDF document text
    • http://keitbg.com/images/files/9887776064.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/lisimigomep.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/75559827974.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613af9b5142bd---7509363429.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/21565708091.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/fuvexobawe.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/595878423.pdfIn PDF document text
    • http://samtle.net/ckupload/files/84152104586.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_off000143df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143DF 10668 bytes
SHA-256: 2152ce7024609dade978eae1dff4501348e0ef4df715995d4e8f556dfb0ac12a
font_01_sfnt_off00015c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C21 21872 bytes
SHA-256: 3820f55cfb2e126852fcf1a1bd584500cce1c171732f8de613f1f444eaacf941
font_02_sfnt_off00019564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1