Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb2322b123886e36…

MALICIOUS

PDF

85.6 KB Created: 2021-09-21 23:31:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d218faaac052e1d5e960ed7fd1c686c SHA-1: cb7444fa8be81fe264c877283631e46b1513f127 SHA-256: bb2322b123886e36afebefc6ff2722ba6564bc970d87ba6ed3a6ce43ac10a60a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a malicious lure, employing a link farm strategy to redirect users to external websites. The ML classifier strongly indicated maliciousness, and heuristics identified numerous external URIs, including those hosted on compromised CMS uploads and disposable domains. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lead users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=how+to+use+phone+as+wifi+adapter+for+pc PDF link annotation
    • https://whiteplacard.com/UserFiles/file/22205009057.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613278b61788c---jegitakawajafijawikibin.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/52201447167.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/luzapidizogiguluni.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/80522000294.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/wobijadademozipozofodor.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6f7e5dc72515a034b3da10d672f65976/lujesatutetuzijamatokese.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/89281670058.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/50349346522.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/wujilun.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/monax.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/folibesudikulu.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/66661928415.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/52677100047.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36445895458.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/b2evhnr9i2puu1mrrq2i6knl192c7qg2/tizevuvomafituro.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/43388897832.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613848343dce1---68546625474.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210918101739.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/nimakubedoduvelesu.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/wubudidumobezapes.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/golunoxinanefobijivegip.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109062036295751.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_off0000e815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 18020 bytes
SHA-256: 8e2148bc3c4ceb9a2379392c640ac1cbe45a812cec590b7eced4115f85f647ba
font_02_sfnt_off00012f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F59 10848 bytes
SHA-256: 554d8cb7ab52ba8581b14deb8aa29c0c1c96ba4f52429d395cda476569e3b006