Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c4b71c1e479372…

MALICIOUS

PDF

91.9 KB Created: 2021-09-19 06:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4d96aedfb9befe692f182289ea9edb88 SHA-1: 2c1fe855bd96644e55d214ec5225ffc7b9c93712 SHA-256: b3c4b71c1e479372859b69771fecd580e7f95ff791ac4e0aa6852927c3db3893
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised WordPress sites or appear to be disposable. The ML classifier strongly indicated maliciousness, and the link farm structure suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://pixomot.ru/uplcv?utm_term=war+hd+movie PDF link annotation
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136edefe3b3b---81482597288.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/nemuwizolizubawanoloxo.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/7519567285.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130695878412---fowumexabidakilizevo.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/19554621770.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140e6ddf2849---18582701191.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/15171628238.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/50275325165.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/sivosanojifevimukife.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/26710428021.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/powavaragenasutezupoxali.pdfIn PDF document text
    • http://vln.nl/files/file/60385705826.pdfIn PDF document text
    • http://pasted-radio.de/web/files/taxafemegokaxi.pdfIn PDF document text
    • http://client.diffuse.info/files/15022150279.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/liwoxonufanegipijexadi.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/14358819301.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/xuget.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/lomaxobobefatoxu.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/gukiwojovosakiwa.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/rufuzivekokuk.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161342cd96bdcc---sutumim.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/45830361610.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/limemosironuvekoguderut.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/59937417831.pdfIn PDF document text
    • https://xn--80ag1a2a.xn--p1ai/files/file/daded.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_off000106d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D2 17228 bytes
SHA-256: 75f5a71703222c33013f4c8c9c85173f689cbbb5881417c2788152b7ecbd7a8b
font_01_sfnt_off0001338f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338F 10156 bytes
SHA-256: bf06db1f878a8cbb1c1e7901f2dcb067ac5b1606b3ab0782a496ad5041362a6a
font_02_sfnt_off00014a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1