Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e0254bdf20deaf3…

MALICIOUS

PDF

84.0 KB Created: 2021-09-14 07:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0174e62fbe5f9179a8697e1ce9d41ddc SHA-1: 39186212e8724ff0a07ba0dfd9b769a88474aec3 SHA-256: 5e0254bdf20deaf3d4991d498bba280a1ad4cf320aa33fce59dc769aaae86b64
96 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to various websites, including one hosted on a compromised CMS upload storage. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://deaprogettazioni.it/userfiles/files/28661832896.pdf In PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/gitorulukagasefusupidid.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/33148223503.pdfIn PDF document text
    • http://polipack.ru/content/file/64035725146.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/70585327026.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/4b7a73d882559c817a0c7cc84c8ee2f3/sinifirebaguta.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/66856703820.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/fufumasanena.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/49813938434.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/76f686e6d2fc7cc11f61eb8ce1803b89/11666477831.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/40236254142.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/zibilesexapogonafuzufinis.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/mewesuwogefepugedabukoded.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109011508541903.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/88788498722.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/40632818606.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/4647885965.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/tumodotenoto.pdfIn PDF document text
    • https://terrebleue.org/userfiles/file/39470536114.pdfIn PDF document text
    • https://limsurempat.com/contents/files/95142178477.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109101204097707.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376c78b2197---77683641187.pdfIn PDF document text
    • https://doitoutdoorz.com/file/FrDWnAMUqhrf3VqL.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=autocad+download+crack+2018PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB6 1868 bytes
SHA-256: b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
font_01_sfnt_off0000d66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 22788 bytes
SHA-256: c88ea0fcca98e1d2b9fefaaf322536483393223c7b7093a8a9056c7e06ffa8ed
font_03_sfnt_off00012956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12956 10732 bytes
SHA-256: 5ef731b31d07a664d5846d995fe224103cbfdccf1fb053dac9d4ff40588fe1ef