Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b194e20dbfda071…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 08:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1904a46891c07d497feee5488def5c0e SHA-1: cdbc00f50347db9e9c7181ce47f531cdab7e8d92 SHA-256: 8b194e20dbfda0714d2756db5a1940a9c8ac23a69c79d38846aadb45aa5817d5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests a potential for further malicious activity, such as directing users to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://ifbscalidad.eus/files/galeria/files/94688005873.pdf In PDF document text
    • http://unitez.net/images/newtech/files/lifuviked.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/5fmslniqnfrpmo2nvdsr6qc42r/fukivaxewateroxepunuwajef.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/98444334087.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/77605901658.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/duluguvizixozidukadorobiw.pdfIn PDF document text
    • http://www.moyekolodin.com/files/12687660393.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/4bf2h4u2svhknt3u9no5rlmf88/kegulerabutafukokokujag.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210911175853.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/25735611277.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/16197937879.pdfIn PDF document text
    • https://anup.bo/images/files/42855195335.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/natimiluf.pdfIn PDF document text
    • https://mlspoland.co/files/file/vefigerakiwovovofadozabod.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/33392696551.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413b616aed3---giwobewikenid.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/36867520919.pdfIn PDF document text
    • http://sivam.pl/files/file/womaribafeperigo.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/90417782268.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/86517815347.pdfIn PDF document text
    • https://kurishupally.org/userfiles/file/57370945932.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/57704913145.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/luwizip.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/vagovegutukojenerawi.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/35988864175.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/lededetujinulusujugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+retrieve+deleted+pictures+in+androidPDF 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_off0000b8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B3 16836 bytes
SHA-256: 5327755a78486e95a06ebc30b2766e2e2c18bd96a76a72f1c17cbb7b13a84fb0
font_01_sfnt_off0000e3a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 10752 bytes
SHA-256: e23722777424fc5e6f3d10ccac0502555f22a87488d37bc5edfd035bd2d56ed9

Open this report in the interactive analyzer, or submit your own file for analysis.