Malicious PDF — malware analysis report

Static analysis result for SHA-256 24dd0d79098cd332…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 01:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f851f45a219f138304609825145bcd2c SHA-1: 66d0e439fe01d4d674e4bb297208879486d71928 SHA-256: 24dd0d79098cd332105d9386f3949d5ee6a9cb2dcad87b3ed06e661cc9e03707
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The presence of external URIs and link farms on disposable hosting indicates a distribution mechanism for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 https://inwebjor.ru/uplcv?utm_term=130+pounds+to+dollars PDF link annotation
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/0c0aa6ee40b91a0f24023b236ccac852/keripopu.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb437194f---nuxaniroxepurepasiri.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfd3347fc---1121497843.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4ba8f6094c85993a6c6d52b33d08bb86/kukafilori.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/luwozoxomarumorafaxuba.pdfIn PDF document text
    • http://thegioioto.store/upload/files/biwitojebejinolejatum.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8a8ba52f9---puxakadebuxefuxadagedozaw.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/xawosafevalufupunejegewoj.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/vaau24vgvohcobajdj95tp8290/51008086512.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079366dd9823---49826333034.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/aff180cd35dde53f3fc762fc157ad25e/kepozuriteje.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44300c4b79---vuvogajasofu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb51690968c---bazenu.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/votoluregabufazitaji.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2f09eda263dda98a24f9ead3824b964f/tafinuwavazuwanufep.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/9d740a3c46a959873a9399d4776b86cc/fogujobur.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/lujeruxakalagirokifu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3c42b8280---36958365841.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160799f8ec2c2e---befor.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/19a02c0725b2d876fad4bd58d6fdc43d/49605453053.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/a58840b38745b12cb4cb4df28bc7e0a6/26464225903.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080c96ad2cfc---11608720375.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec9928feb2---13831234322.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6ffa890e0182a929faad0f41055ae328/73030347358.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608fae587cf69---zodikewakezajavodaziw.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/39678976873.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_off0000f23e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23E 16672 bytes
SHA-256: c71d34db25ae1d0f544687e847cb114b94587fe6f645d011a9fb33e98542b423
font_01_sfnt_off00011dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEA 10508 bytes
SHA-256: b22fdd02bdc9d4837d8dd53c55c4aae92381ebff0b8d39ddb2d43db8b20ef1d8
font_02_sfnt_off000135f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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