Malicious PDF — malware analysis report

Static analysis result for SHA-256 967fbdd0daa02c73…

MALICIOUS

PDF

70.7 KB Created: 2021-06-25 12:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 186f5a9df1c3a91eacce733bcb5b713c SHA-1: c63a1e9e75a76da6f687c822e18cb17938572162 SHA-256: 967fbdd0daa02c73151f4fae9b5522de56095381dd73cfdb3b5f7a4e5ea88781
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to external, potentially malicious, content. The document body is unreadable, but the heuristics and URL analysis clearly indicate a link-distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/92d8d25b3f0943417d5b91f1d2ae686e/tumipefarasufab.pdf In PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc9643dab8---xefofufotuvotuja.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/litidezibebej.pdfIn PDF document text
    • http://klpa.net/userData/board/file/82038388711.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/45p75ftghaafjhbav754ahi1l7/ledufod.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a181ff59b62---fafoluxir.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607085d59147a---kitexosuweluberu.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/wixibovoludotabopel.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-26/20210526081721137697.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160717904145e3---xojujedowarakuwu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1mhicntlu266a37kgn7egm7hjh/sivexipinax.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/4f9ogsrr37mcqfle7ca8cd1cpj/pureziregadezok.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/nesuruni.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2a8854d6a---84710304505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=a+cellular+tower+relaysPDF 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_off0000b60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60C 15912 bytes
SHA-256: e4add6a7c2b56afb49117ed86fc6cbb70e008d390bd5241d12f32511148c29a0
font_01_sfnt_off0000deb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C9 10308 bytes
SHA-256: 27d24d4af0cb1a1c7c4d6412a51219e5adc5384953f1aa296cc9c151ac6f5b50

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