Malicious PDF — malware analysis report

Static analysis result for SHA-256 17abf59fd6df0d2e…

MALICIOUS

PDF

112.6 KB Created: 2021-06-11 02:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e4295c23431be70d5538c2f4ddac21f4 SHA-1: ef9916089c9113b9632bdfc01af4dc5f6e978023 SHA-256: 17abf59fd6df0d2ed30165873ebaffb1ae20941656503914b91b5ae0a5d21c0e
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=mikandi+mod+apk PDF link annotation
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081549d80788---28062748526.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d20baccb---10783353399.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/8eca3c103c444cf06f0723fe9196303c/95430270830.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608937a1a7b72---62907371205.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01aa526eb3---71063541991.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/tfknk47q2i2vb4u5mhe4ngjqp2/61761150253.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed6c7722a---zoxaver.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/bupuvigopipojuneniwup.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df23182a71---poburaxixevimivumiganexud.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4dscmqg1s3du69h0vh5ekf1v13/xepoxuxakoxefegawapedone.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/3a4dabd95e6e0fc7e7876627f06887dc/nalaxu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/7f4457f5a4daf0db957a4bc310f8d7db/63736444516.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/377d804480793a49c43961a55eaa6d7f/sadejelogorowojizifev.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/xawubidudeno.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/metasukutisep.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/80652341131.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e375a613e6---dorederebibo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/ximuvopitudud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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
stream_003_off00012e8c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12E8C 14744 bytes
SHA-256: 2a878c83b3c8a195941d0e77a43d8917e022aeb6caca6893037712ac0dedc6e0
font_01_sfnt_off00015eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAB 4868 bytes
SHA-256: ab5fd3dd0f7dd8ea00cfe00c1fd753b3980d99a94652d08dd91bd2bafc0b6936
font_02_sfnt_off00016f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F35 12868 bytes
SHA-256: 956c2661634f2b94eb55a76a9339e8929ad0ece378ed155ea4c111d6d2ec9561
font_03_sfnt_off00019971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19971 17664 bytes
SHA-256: 8a85407538f6da338c205d0ddd19f4ec59c00209d69b34eb380b744da83cf7a5

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