Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad99c332abe05f1…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 01:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4d868e3e6c1595d7205a81c58cd34be3 SHA-1: fef9e27b85d41db47050d44f25cb5a6c23dd455e SHA-256: 9ad99c332abe05f1b009aefc929c92f7868c88a38ab47fb85fce6e412b10dad2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=pdf+character+sheet+5e PDF link annotation
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/51339111742.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142160315c25---gilepizadanibil.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ca6bf15b559150665386937bccd9dc97/vowizixejiputipesozexaw.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/51263494215.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a77bae3f55---89725270552.pdfIn PDF document text
    • https://cebrium.ssnn.ro/images/filowabijerifodukenewes.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/28014889632.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b42602709e---40698146250.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/93037030519.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/xokagujo.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/84051907452.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150adab4a900---tazog.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/24ae98195d90d3a027331ebf67df09db/tojazurugunowuraza.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/446181564.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/mopobugekujixez.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/35700770828.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/1872128225.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/tikozoxosonisimetopoma.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/gozitelolexotesobozigo.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37652680113.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/65686251360.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/lavilopixolosiforumeret.pdfIn PDF document text
    • https://tomaszbizon.tomaszbizon.pl/web/uploads/files/vifazopunawakalexa.pdfIn PDF document text
    • http://tavio.su/files/file/vimazazepedimefeji.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/losirilalowariwidusojoj.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_off0000b113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB113 10344 bytes
SHA-256: 5a880046e6b43397f4599b180d9156e849d937dcd80fed249f4eec63caea64da
font_01_sfnt_off0000c8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A3 15464 bytes
SHA-256: 02e207c68364ded9a90fed856bbe054d209f80ac3b6e4db3e6a8fe1973ee76f2
font_02_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1