Malicious PDF — malware analysis report

Static analysis result for SHA-256 135090c5e652033a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 04:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 53ae34c63166d0573fe2b564f9c09699 SHA-1: 1385a4cfef6b088d62399994bf4cb222e8f415c3 SHA-256: 135090c5e652033adb15c7940d9de2b90cd428ba36615a14242b051235c1b442
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 0.9991

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://pixomot.ru/uplcv?utm_term=asset+accounting+configuration+steps+in+sap+pdf PDF link annotation
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/3129cdb30a701f2b3567d5cfddfc3344/40179618474.pdfIn PDF document text
    • http://davcpundri.com/css/file/30012063897.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90f670547---zezuvi.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/vabajefiw.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610263cf30ace---serop.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/10764155474.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/25242703831.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/tewilasikawelilare.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210708_024ADF0E79A04310.pdfIn PDF document text
    • http://hidropro.hu/upload/liwakapepavezopoku.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/sejimiregiparinuduwera.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/19396977781.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845d61de544---vupinelagosurigulekitez.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/90c7v9cuck2nhdkkrvic121op3/rolas.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f2183bbb36f---mumiwabu.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/rigesivivofeno.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/d9632600d0e14258ffc23856cdbe40c8/tusixasaxakozuwinafara.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/181381117610a6301cf8b0.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f64cb1ccfa---17712176305.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a77a7adb2f9---5620368803.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/48o9n8le7cu2r9reiip9o3oi54/ruxuxipudegimibub.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f490da44a---24934646464.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/fovujonujiduxofano.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_off0000d8a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A9 17572 bytes
SHA-256: 0de2a8681ddba62c95595f7eb295a2cece4cb529aeff6852b9fbe5800746cabf
font_01_sfnt_off000105fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FC 10828 bytes
SHA-256: f8d7d15b326103b8d5937fc745702489f64c9fb59dc8eb99d44e2a8701288edc
font_02_sfnt_off00011ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1