Malicious PDF — malware analysis report

Static analysis result for SHA-256 1137c687c22ba23a…

MALICIOUS

PDF

90.4 KB Created: 2021-05-10 02:47:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 887b7b5e26321d477602ead7cf474601 SHA-1: 03607a563fca7d41172aadab29a2ca61a576105c SHA-256: 1137c687c22ba23ad8507732702544c6f613270d3b70cda36df883f61a3990c0
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 0.9996

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://smidgel.ru/uplcv?utm_term=bmr+full+form PDF link annotation
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779c0673d7a---19509248545.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609038a48662a---7692963023.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a31eaa2a49---74278998142.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ea6d133b25398ed0088d7ec10e14cb9b/36403712810.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/14727672511.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/6ba5d715a870f6341bcbb65c5c9aa0c3/51184589137.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8208040639711508f058f250381e2c09/14853467919.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/todakakinirodinosumifefev.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608530d8ea1ed---sogivejelareboxekedebe.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/13a77880cffb9709e0b66151014c23ea/fajafozagunigetota.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/acaa89ec9bbafa7c9b21b1ced4825d20/wijapon.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4452f2a217de74b8a6c924e0e113b0e2/vedumijoseki.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/312cd5d991d416186c61ef0f1da8dd31/diriloruliwumud.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/566e0b0f5a87d91ee1fcfcf118f83f41/fiziporud.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kuzasafupute.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160741c6dcf4ba---13435055741.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011865.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11865 17888 bytes
SHA-256: 0d099c4d0190d4d6ab30e3d19103513c0b7fc8d20e194d6003df1b1c6ce3e775
font_00_sfnt_off0000e361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE361 4576 bytes
SHA-256: 55f1308e9c02b561dcb91d55078f0de6fa2ad21654ac9f769777f376c6d49adc
font_01_sfnt_off0000f2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 11160 bytes
SHA-256: 79abfd7845a7a79b8d0a3e3f893c94d18003e0934d4e74b3f93bb4df24ce5080
font_03_sfnt_off000133d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D6 12692 bytes
SHA-256: dd3e49706dbf6a56abe11b1695f2d22b90249ac57e418174f86415edfaaae643

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