Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8d9dad404dff7a…

MALICIOUS

PDF

92.1 KB Created: 2021-06-29 11:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0a05ff4d5a145f6ff07caaec1f82101d SHA-1: c49441b1aef5c503d48e1b08ba284ae2287ecdcb SHA-256: 9e8d9dad404dff7a9f56b819b9fa828934251900c49087ee65f137a14f1c1d69
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or redirection campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://ketchas.ru/uplcv?utm_term=chapter+5+intro+to+business PDF link annotation
    • https://actor-conseil.com/files/file/92313168480.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/nisof.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086204815ea7---21271539250.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f418973492---gotige.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35b07f8c3---79320704543.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/16597310907.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/kisiw.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kibtp418a75u833v332j7n2qt4/4565588718.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c924d94fc18---35366153829.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608353e0e90dd---negafusufefefowaf.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c05c7111514---tukefififitegizivetiviwo.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/52608139611.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d20a30124cd---78426055711.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/18217710793.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945eacbf555---92311001548.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31ed85c99e---sovigalojolafusi.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/72375251410.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/wogewozu.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/kikakuxafofaxugasamukid.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e89eab141a---44509027597.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05197b20e---82116259913.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/jaxogokomiwefasurilulug.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/vojuw.pdfIn PDF document text
    • https://mmszke.hu/files/file/63982717867.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/97146269931.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/52c826874b8831a8935f4378ae6cd05a/61006015292.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hs9mv8o0nr0ec2718ufg4aia9s/35007017218.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_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 10708 bytes
SHA-256: 1c5bd3ea5b1ec03f29e673dbed5538ceadf5b0dc55abfede2b4f0a43371a0f3a
font_01_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13627 17188 bytes
SHA-256: b8dbc2e8cb041d31e4daf2ced1f9c9e3762f8b81d16c90d5de6d0c40e8e24ef4