Malicious PDF — malware analysis report

Static analysis result for SHA-256 4724b0b4f2d25639…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 15:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a394a37683572bafa2c858536df30bd SHA-1: ae5346f0fae5d805d9ff832693d9e47a1a877c63 SHA-256: 4724b0b4f2d25639549c576547e619cc7e57bc92e956b4bf6b213a0aa413233d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=ulysses+joyce+pdf+download PDF link annotation
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/6de6a7c0d4a3cb12e99c7a7b48214032/zedetewojupos.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/bozerisatobim.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46fa92adbe---legetaxuk.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/n9759ei9d2l21svluivd782qqi/xiredodisajuketajalusuxo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900fd6601fb---71419104923.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/64166906416.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c92aef432d7---rijibabalut.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/wowirisupipara.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/63671582326.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9756b8248---26622784358.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cbbe3f868---temawezesufipusaludo.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/75752081075.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333f67aa9b0---tabigelosugolumabi.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/piderutagime.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/99690790798.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/k2q30lcc4j4ktek5kr6e4e13ao/90754421205.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fae89d2b1a3d119d04d08d93a0ca3d10/91047537351.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/lobimejutisugomurawufo.pdfIn PDF document text
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/nolikume.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730cd81451f---bigevikeserekotitu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f0aa427f8---95057926350.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/85196397373.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_off0000ec7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 10660 bytes
SHA-256: 214608aafbad6f57402cc41093d34c7070e911b1afb4ffc294267a640fe40531
font_02_sfnt_off00011d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D31 18016 bytes
SHA-256: 5fd72e8f4fd05cf757ffca8fd83edc17b27839d8d1beabadcf8505c9ef484f8b

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