Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45ef78627ddcf5c…

MALICIOUS

PDF

83.1 KB Created: 2021-09-01 22:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9964d2f204b33d7a649df9902943cd35 SHA-1: 9d4a56caf1739459a0e81c405a67a33609923aa9 SHA-256: f45ef78627ddcf5c916fde42cafca38eeee2eb3f4a6b23bc6aa5e54506e488c3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to compromised WordPress upload directories and disposable hosting, likely serving as a lure for phishing or malware distribution. The presence of 'LOLBin token sequence' suggests attempts to disguise malicious commands or URLs within the document text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://nomylo.ru/uplcv?utm_term=kirby+right+back+at+ya+episode+42 PDF link annotation
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a17db17f4f---97985619183.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/zukajemuwubu.pdfIn PDF document text
    • http://bidhichand.org/sahodyatarntaran/userfiles/file/11470071895.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607490450c8e6---5548393015.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085edf8a7f12---zimem.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/57180532260a203d605089.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/91476143145.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/rasupitegatula.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/7f08227c5c9340e8e8af35db115a65f8/76528121559.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/13965245228.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a75d74c27---34022225597.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/3cnda1gq719jg84dvcmddgakbg/nizojumez.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/mazodovojix.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/dab9ee7ec7e79c6a543fd648d4d5e9a1/76737405153.pdfIn macro / runtime command snippet
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78472722075.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/tigapi.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086fca25913d---divewerutenumesuzu.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/robixavasokomonopos.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/92753865008.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdf818bd43e---26325791634.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/vepebefosofebevalepu.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612c9debaf461---nefemarixejoxurunidisaja.pdfIn PDF document text
    • http://henca.com/files/details/file/funono.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086cbeb18147---rifovodabalipig.pdfIn PDF document text
    • http://kammatrans.com/userfiles/fileIn macro / runtime command snippet
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d144a9fa7089bc72ee70db8c5cb9f02c/1070921823.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3ED 21296 bytes
SHA-256: e94ddc161c9fe978c069efe5e2016199c730d331cf02cff0412bac02c7714165
font_01_sfnt_off00010b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 11180 bytes
SHA-256: 35d86073eaa8d71644fdccdb67ee113513de9227b15b4c7d9347a379563fb9c2

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