Malicious PDF — malware analysis report

Static analysis result for SHA-256 239ba0d303f8adc3…

MALICIOUS

PDF

98.3 KB Created: 2021-07-05 23:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 13dcde9fef1aa319ecb580a6b4fc363f SHA-1: 9c62222a0b3d907a0f30c734678f10aa2886fe9c SHA-256: 239ba0d303f8adc34c7c3123c1ac7d7bfcb40e6c99b90ce67a87660f07c569db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded URLs indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/3daaab7ac06f68c77237f7a09a9c0b54/rekazovavile.pdf In PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/vemikadezoxobes.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f7b936bff---xobir.pdfIn PDF document text
    • https://hgb.se/filer/file/julopaxikuniwiwizowodejiz.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/jm6fjf8fnpf94jr8ti8iudc0dn/zekixojerulenotefaj.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/92597904813.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19268cea48---70053852587.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92a4e8cb6---xijinoxunivi.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/dea3e8af55f4b269e5f85696a9e2b8e2/86558971169.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/39370f91b50a7f3eec61f39ec03a9e7d/vuwunife.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/e2a3011260dc0e406ccea341cf354b61/60448027846.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/93fb240edd0043154fa5b58c9cb4e020/5890679459.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160968450d35e5---91017711011.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zelobozokikonixaj.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d933dbcfc---mibomumazelakuzipegevubi.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d592293d3---15406545265.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/zawejuzuxude.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ue8fkasbif1a5fcmv0l5g85km4/4468365509.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vj4uhu0hsgsou5psmdanr7uj57/delefemimurajekowibozejot.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/kod967mv0tl19v282u533poaii/22759634338.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c014f1e3633---wowonunavukawabati.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/92165154961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=50+rock+and+rollPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/742df7cad4571f210399b8c7e53260fe/joparitizavevuk.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DD 17724 bytes
SHA-256: 685d89c96b538ec0d4aa49507bacc899df45700a694e24453a6027e3d6ef9863
font_01_sfnt_off0001306e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306E 10124 bytes
SHA-256: c99af1c18f89d56ae97d72855d13036832a2ed7960fefb1b1536909d2f184ca7
font_02_sfnt_off00014718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14718 17588 bytes
SHA-256: 7163f1ed4f614313e6e6548f71af2a24e197a7f00f2bf44021d9f9d43015af58
font_03_sfnt_off0001622b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1622B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1