Malicious PDF — malware analysis report

Static analysis result for SHA-256 3280c1b1bb99af42…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 23:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aed9462ca4b83c0b2ca48b1afa09a5ec SHA-1: 8cbaeb8a77b87b760af74464f2c536b0a3036a9a SHA-256: 3280c1b1bb99af42f995d7e58dd753232c3729239fea5e673227add91775d388
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document functions as a link farm. While no scripts were directly extracted, the nature of the embedded URLs implies an intent to redirect users to potentially malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=playing+for+time+pdf PDF link annotation
    • http://demenagements-remond.fr/userfiles/file/20210803084336.pdfIn PDF document text
    • http://wwstationery.com/files/file/92263176881.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161291e37346fd---56475328032.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/61969624129.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85f9ef2f3---webaxirutofagijigi.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/jilivirimoxikozav.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/76060776155.pdfIn PDF document text
    • http://articolo17.it/siti//usr/foto/files/guzowilakex.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/tinevebosudivubezupe.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/46652803281.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad2f876872---kalivorowodipepara.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/q5g5faaukvratcbshoak396mif/14277175912.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/91440582343.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/mepolijiponulivijoguro.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/sevanajabederoj.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f7ee21f2---13857072428.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609404877e8aa---35324556421.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/16555889582.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/xipagok.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/nokajixuzifawonenaf.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/mevokozokununoduxuludit.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/91766950083.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/82671232814.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_off0000b2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C2 10788 bytes
SHA-256: 0f8e9bb6e03fdb07a82a4ac6962ed101cd47e0f57824f74cd49a88e3dcc6d5be
font_01_sfnt_off0000cb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB59 16636 bytes
SHA-256: 801414070a0a6eb1ccb3a6ae581c4cf419b98c4d3181f35e2d4a3646777412ed
font_02_sfnt_off0000f4e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1