Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8444d0aca08f4b…

MALICIOUS

PDF

100.6 KB Created: 2021-08-09 00:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7c88b67734b60acc0fffdf933db1cb80 SHA-1: a6db0419021c62820c603da0a3929fb9448acbb3 SHA-256: ba8444d0aca08f4b42658236d977d1e0d3b44ade95148a35fe5059ea0e3871e8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains numerous links to external sites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to obscure the ultimate payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://huntic.ru/uplcv?utm_term=guia+exani+i+2019+contestada+gratis PDF link annotation
    • https://elsa-daulte.com/ckfinder/userfiles/files/33042583764.pdfIn PDF document text
    • http://nfc.soo.jp/file/xakozurawulerosunoku.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105091029252754.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/jurimoxusifixav.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/57880378248.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/dajotexolaxuwedizoxalad.pdfIn PDF document text
    • https://bselink.com/userfiles/file/xejomigijet.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbbe5c0222---vetisiranunumujawopofowa.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210615_8809823AE3C7B458.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/xogodovuli.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aae5144a1c4---lafedusadigoma.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/tawepidafarifasesudin.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da19c968ce0---97272867780.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/85510983196.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081274505e06---2669885313.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/levadewutosiwu.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/12664607598.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/1g25idqvsafipf55rel74hs43s/15833830107.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/ribomegosejitorizofas.pdfIn PDF document text
    • http://holzbau-napetschnig.at/93494607754.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073929045aa7---3298762413.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/7866fa30b8623deb3c213552c1ae1c99/mozofakoxaropivunamizeru.pdfIn PDF document text
    • http://maxbrio.kr/files/files/94740418703.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/9p0hdn4uepjp2avbsa8st6uoop/39746674829.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ff207fcf134495423b0e1692d1a400ae/53649149366.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_off00011fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA7 19216 bytes
SHA-256: 0121319139bdc6e9f5da823c9f26592a39f4a185d191aad7c8b2af048f72ef64
font_01_sfnt_off0001503a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1503A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16851 11204 bytes
SHA-256: d4f23e7f0057498c8c719874385a3d3bdcbc4d08a672c1c976a6f70e502c5d4e

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