Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc0c298b72dfe5df…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 07:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 32f145bbdb086d29b1fb89fdf1a247e7 SHA-1: 95b78e466c4c1af438e57a94e103a1ab942434c7 SHA-256: fc0c298b72dfe5dff2973cfddf8aa3eababd08b76c2c2aae078ddea9e17701f4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the nature of the links suggests a potential for JavaScript execution or further malicious document downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://ksuskalology.com/images/file/63609556925.pdf In PDF document text
    • http://grandp.ru/userfiles/file/rasafalotibiradatuj.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba52b7bdb91---ratoxuporif.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/78560745152.pdfIn PDF document text
    • http://24cvety.ru/upload/files/lafudetikata.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/38822775121.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/vl69e5bqngvilt5do3m9vfec24/19117778719.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160965a3185aa1---fenotewit.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/91545619347.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/gisapidugogakere.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/24919478288.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/161127e201342e---vurogomadupabumugimu.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6f866911---tugese.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/81336192108.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/volababumawo.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/19774490336.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/94194309013.pdfIn PDF document text
    • http://hotstamping.pl/files/file/sosakoletiridelijifule.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/64759540399.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075a31ec2672---wobipanudolim.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/vikuvodixujunawilipaxemo.pdfIn PDF document text
    • https://aspirans.com/files/file/deximo.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093d6f5ede6b---nizewir.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/af5a6f561619c45b7dedcd92f0225ba2/vizaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+tablet+pdf+ebook+readerPDF 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://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_off0000e1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 10536 bytes
SHA-256: c4c70070036e8a7ac15094597a565d3d2b49332696b9136836dff8781dbef898
font_02_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 18136 bytes
SHA-256: 6072e305101d1539f683c65e617dcfc6327aa24cfda4a0b9c5d80e7a58bc116d