Malicious PDF — malware analysis report

Static analysis result for SHA-256 282e3b9fffa1125f…

MALICIOUS

PDF

87.9 KB Created: 2021-08-20 19:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d21fc1cf2157df0bf4311c61481d6db4 SHA-1: 6b8ff84eb81e1ca34e69cfe59ab9891d53fc433a SHA-256: 282e3b9fffa1125ff8815c56c0fc9ecf466e545a4954db5beefb8c9ad43a9416
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to WordPress sites with 'super-forms' in the path, suggesting exploitation of a form plugin. Several heuristics indicate these are link farms on potentially compromised or disposable hosting. ClamAV and ML classifiers also flagged the PDF as malicious, likely due to its deceptive link structure designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/02d6c5aa9d5f5e94b140d38ded671e99/33056323558.pdf In PDF document text
    • https://goodline.by/userfiles/file/28782547113.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/52070595734.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/tawelu.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/h8s1m9tqpt1s62upuh5a5e80ir/tilivira.pdfIn PDF document text
    • http://ned.ru/uploads/files/duzab.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/lidipubotivunuzesebovixax.pdfIn PDF document text
    • http://htcable.cn/d/files/1259930572.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1f15c71a---xirejozajavofonubuvewop.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/84ff2da70a36aa6a26c56dc161629233/84078613798.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/8211a6fa7161f22abdcaddd5544b1403/muwuwakafadamex.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6a0e8c93---sofowisuzexepaz.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/papadexedupepewuzubavizir.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/74b2de7b6030f10187920c2c26072636/zavajoxir.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610634f01a3db---boxujab.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/9f5dpd9qmra5ishkdjq92p6j01/marej.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/ziguwivibidivexasinamu.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/76270611476.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/f29b075b5a6e5c5a7a389a94c582cca4/nepirifilenabi.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/44699415326.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jezejudekovulavezuwuzilod.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4fe54a149---lekoxe.pdfIn PDF document text
    • http://vlajamo.cz/images/file/talakupuke.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a236086c2---juguzazolo.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/74bd9d714095b499c4dea028e0cad888/ketokupojekiwozogu.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/99382932447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+learn+american+english+for+beginnersPDF 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_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 16612 bytes
SHA-256: 0318350cba68e05683262326cd73dd01761676743bee741baad9dbbfd80b1ba1
font_01_sfnt_off00012041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12041 11000 bytes
SHA-256: 60a06293c5d5175957dd153a3cf26a2a11ac353c213f9fd87f27f5e74f4b4e90
font_02_sfnt_off0001399f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1