Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f407215def91545…

MALICIOUS

PDF

182.7 KB Created: 2021-07-14 07:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 767843f785ef5cc276af75b538cee956 SHA-1: 6314d5bbdc35246d591c8ad0984463fd96003c90 SHA-256: 7f407215def91545450494a9f69d8ddfe4e2a0ac8f8529995181d49071d49771
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to distribute malicious content or phish users. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3740689302---bobezubenulunolibovusovi.pdf In PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a10a11bfb---vudononozuw.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/a1e6cd65c35a7b3de51054becd644ad8/14677532875.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/xinuju.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/54395368816.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210520192825.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/2a2d430116568dd060256f588e4b1578/suletozekak.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/58903324099.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077a3f5b9415---zebenamesuzujej.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/7782637579.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/nulewoxukigu.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/zagijorewowuvadafuvevonol.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e24aa820d---sobudon.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/9192764810.pdfIn PDF document text
    • https://isleo.com/i_photos/file/82433096869.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/52132407525.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160864d04647da---xapasaxatajojudumo.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c58cc0cb---rifedatibuvetoturezojiro.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/3534f735e85d19b4140bf97e429b6d44/92272355014.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/fodifawupisuda.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/bogatavolatupojap.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/50746724595.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/15509395762.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/68340975761.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dispensation+biblical+meaningPDF 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_off00027242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27242 16396 bytes
SHA-256: 0be741b1d5ca431d54ccd049258a2f4b67bfaab8fcf850f974cb17714e34831a
font_01_sfnt_off00029ca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29CA8 10760 bytes
SHA-256: c67715cf39c49832dfcfadca3e295a9dffef7a8a9e7269b5c3cb329130a40198
font_02_sfnt_off0002b530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1