Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d8845195f32165…

MALICIOUS

PDF

100.3 KB Created: 2021-06-19 11:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f86edb2bee27c121473230b7109370f2 SHA-1: 00d5789bcdd09ec20c6739fc17690c28f5f4445f SHA-256: b0d8845195f3216567e6462e8ff057848cd367fda85945209bd6c13d4aa1c1c0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised websites, including WordPress upload storage, indicating a link farm designed to redirect users. The presence of 'cmdankcgpvbvdq/jakemej.pdf' in the document text suggests an attempt to disguise or obfuscate commands, potentially related to executing further malicious actions.

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/fdd142c8af77f85fcf001abbb0355be0/nabosisavaxetolemupi.pdf In PDF document text
    • http://suachuaspa.com/upload/images-content/files/83197346811.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/75738186164.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/suluzasuzimikilitenidug.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c34036c6e---lijedujamexowogilolokudel.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/fb437ed1f1a7a4f7637adf6c4de16fea/jusiz.pdfIn PDF document text
    • https://dhesient.com/media/50887522435.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16087a02bbe152---75890427605.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b52f5ba8a---66922552907.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/6077442611.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073249615f3d---47399927229.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3b0hiqb85vcrcmdankcgpvbvdq/jakemej.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fdd380238---rusobexenumot.pdfIn PDF document text
    • http://metall-press.ru/files/bivusamitu.pdfIn macro / runtime command snippet
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/dd8e6c6e3f404f6e3ccc38ce58d9ba50/gaxojopinowonekejuziz.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/rgn7s0vgnsad0vkqkq6e9vqc3n/sofufasagigepaz.pdfIn PDF document text
    • https://storage-in-motion.com/wp-In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=single+phase+half+wave+rectifier+with+resistive+loadPDF 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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C8 5672 bytes
SHA-256: 3282ed50c6aa864b43c37011cd475f1daeed553d3f29b2922e89932cc16e7f78
font_01_sfnt_off00013d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2B 14528 bytes
SHA-256: 87d7536b64fe3a2a3170f1cc861ca12859e311f78ac6fa3e462b405c663d941f
font_02_sfnt_off00016df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF0 16156 bytes
SHA-256: fd9bcd209408828be3729d26b98929e2c109323d830403e4cd7fe6d99727217b

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