Malicious PDF — malware analysis report

Static analysis result for SHA-256 3caddc978358a628…

MALICIOUS

PDF

83.2 KB Created: 2021-07-21 19:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af0179c7da074362ca551e2d7fd121fb SHA-1: 95fc23a488ce1b9343cb99c55049068567f27d87 SHA-256: 3caddc978358a62813051309f3fb057fdfad5a190f852f6b5e2d1d93e5459e40
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://thietkevuphong.com/uploads/image/files/89637495495.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f698bf5c7eefe21b92e9759b4741c086/ragomomoxi.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/3fb9c1b5ded38b624243c2456ef6747a/95032581352.pdf
    • http://cosmik-kinoteatr.ru/sadm_files/93878050993.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6f244a1f6ab9cdce84eceea1013f69ea/24152626606.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/aehv2u6q4mish150eo8bjtkkd0/57119350001.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608793d9a74d9---kaxaravize.pdf
    • http://ccswcd.com/userfiles/file/75503113505.pdf
    • https://migger.dk/userimages/file/98199979784.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc01f41b40---buwazuke.pdf
    • http://files.ibiza-ferien.de/file/15844752057.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/65aaec14eb07e45b2c546eb0eec78b03/53844501644.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3f219689---masoveseluninonawogozuxe.pdf
    • http://chataphan.com/file_media/file_image/file/jufurosadike.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ms231k8bl11eiu4fegai90ilfc/zujololopimidikidaba.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c3a7b85d328d631171eac01f36d16f06/63434100965.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609f92437e9e2---2527434942.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf61044078---pitib.pdf
    • http://omni-links.com/images/blog//file/vefixopal.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56b9a4cd8a---74601825622.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8ed22c8ae8a7e1fe9068025dd4a17dfe/31060760850.pdf
    • http://otczenacts.com/media/files/68555500967.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/89k9su1gmsum03c9kvd5cvptq4/xaxekobedawururemigibol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+find+molecular+orbital+configuration
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fc.bin
c3d55ebc7513b39af777ebcf319d674a665b11d5995381ba82ab31ac968a2e6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 16760 bytes
font_01_sfnt_off00010dbc.bin
c9b4eb5d2a1806116cc58c8e4fa0d16a30bff535788a8acb224fcb93d38d253f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBC 10968 bytes
font_02_sfnt_off000126f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126F0 16792 bytes