Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81a6984b2ce9c6c…

MALICIOUS

PDF

79.0 KB Created: 2021-08-18 08:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8efda663c034af83195ec71590a0928b SHA-1: 2fd3fc29b8a68f87cd398ba62bf927ca27938ff2 SHA-256: b81a6984b2ce9c6c1cbe0e2410e71451c6ed3c0b8d87d4f42bc81cda039d9fcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to multiple domains, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable binary data, limiting the analysis to the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a599cb9d55514ac1febd0fbb8d6bf64a/netufikasetiwefe.pdf In PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/1270174191.pdfIn PDF document text
    • http://bjjiffy.com/upload/gugusemetawesibe.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/zobos.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/48719112151.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/24180354012.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/msve371gk4i7es7qo900s7o467/58339389698.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210716114819.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/zugefixunamuvamavog.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/02f88bcf2d02d28fde18e069d2243535/38624251790.pdfIn PDF document text
    • http://itfind.ru/uploads/file/17938359524.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/27247064256.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/75758375253.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/bdcc66bb936daa5d3f90e858565ea28a/disaka.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/fajodejuwujegegubuw.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/11796722422.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f879f514c8---nuzuja.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/2k3apubddd0s1k85ctqhceof9i/97404731544.pdfIn PDF document text
    • http://apvn.info/userfiles/file/towopumesevelakopukebas.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/94b76a9b00c673e87b82a8bea482715a/43651983146.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/48ed6afd0ed4f84af4f9db48b42ea4e7/41251958667.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160936e2227250---sitowoweneki.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/64347284337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=what+is+black+body+radiation+in+physicsPDF link annotation
    • 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_off0000d1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 16272 bytes
SHA-256: e3b6315c1f29d4975b932869cedebc4dcf2f4322e49180c4acbd90f24b14c09c
font_02_sfnt_off00011402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11402 10820 bytes
SHA-256: 82a459ac0e845caeba2826c1d6af5129da82e4d4437cb89bafc45683e40c8f69

Open this report in the interactive analyzer, or submit your own file for analysis.