Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a9b246f54cf611a…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 03:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 576e46d4f95be1bee37122119ca5f2db SHA-1: 0fd8b84bff919cdd7788f957e30d121fecaa2d83 SHA-256: 8a9b246f54cf611af7d07aa4f8471813c725e6474a2c1696c186ea7ee32ae973
196 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the document functions as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=movies+like+the+wolverine PDF link annotation
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c459b33156---somoxirunokajul.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/57299474293.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/benatob.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8edf4df833dd1bd6af3568cf605fc786/39481138107.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/23494194459.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/77255855527.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab03b4b31---dakojekujetodominerelex.pdfIn PDF document text
    • https://citronel.com/userfiles/files/tetorenepex.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/puwud.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/kanobowajinefem.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/e9rk24n10mjd7549b354c5bo91/13101561676.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/ukmpevsa7bjdonpgso30pd99im/lekadizagukemojisupilirog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613864b2745f5---tigipixonekoti.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/86878191162.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/foseborimiguxamelapiwilo.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/45476345765.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/kadet.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/34835904010.pdfIn macro / runtime command snippet
    • http://www.egymast-segito.hu/uploaded/fck/file/53218313887.pdfIn macro / runtime command snippet
    • http://lsphc.com/userfiles/file///retimogewa.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/xewurujekereda.pdfIn PDF document text
    • http://househouse.it/userfiles/files/junawejolekaruwofifani.pdfIn PDF document text
    • http://machulski.com/public/file/62276555017.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/12233587435.pdfIn PDF document text
    • http://michellenevinracIn macro / runtime command snippet
    • 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_off0000eb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB27 10280 bytes
SHA-256: 1a47ce2b9f102a766e715844ec13051c65de117bd619816bae1b8771379ec5b1
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 17800 bytes
SHA-256: 272d6c2de10c5bc55f730cd2dd97d498c86364afc171e6791b14ed452b3e0524

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