Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db11521aec0d0ae…

MALICIOUS

PDF

66.5 KB Created: 2021-09-27 16:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9edf211f0a3147682da4b69d333637b SHA-1: 1aa4ed372a1897b73f742f457b03008142546610 SHA-256: 7db11521aec0d0ae1e7bd1ae639418e15b547e487c4102f0612f31dd9abdf5a8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external sites, potentially for further exploitation or malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://minuspk.ru/minuspk.ru/userfiles/file/bitabop.pdf In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/66b127f0279589972176212b6ca4f7a6/fowuvujijibejedes.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/23631321438.pdfIn PDF document text
    • http://packturf.fr/files/29559912121.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc86da0e2---wawobek.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/kujitafino.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f1619f289ed7e07d3e5ed7b10d8d0881/35016869352.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/37323774632.pdfIn PDF document text
    • https://artenika.pl/fck/file/4793923414.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/54068908879.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/45061491569.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/59288989855.pdfIn PDF document text
    • http://steinemann-ag.ru/dadubigoxemazotax.pdfIn PDF document text
    • http://emannsltd.com/userfiles/26400925683.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/losatatimijojosu.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/44555900839.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/mebowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=satellite+finder+pro+appPDF 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_off0000a69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA69C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000beae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAE 15524 bytes
SHA-256: abb646182c9dc1a9b1318ca1a242fc6eb9a919e15441f98515314c3976d18967
font_02_sfnt_off0000e5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 10400 bytes
SHA-256: c01c22c7a9a0cff51e7ed8b4a63ddebe105409b9c04683ee2b37f987edc05e78

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