Malicious PDF — malware analysis report

Static analysis result for SHA-256 2942518d49d010eb…

MALICIOUS

PDF

89.4 KB Created: 2021-09-15 11:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 55977b00bf02234c45e6e1fe2026da1d SHA-1: fb130dcfeda303ca5b4a135e3fffabeb311f3dbd SHA-256: 2942518d49d010eb576e9a5c3cef11d68e102525ef72827e207c49a5f4593a13
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to redirect users to potentially harmful content or phishing sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bibliotheque-des-arts.ch/ckfinder/userfiles/files/joresiba.pdf In PDF document text
    • https://taevlingar.se/images/pages/file/mokok.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/60913973522.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/38179688677.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/fusizore.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/61599692328.pdfIn PDF document text
    • http://keacg.com/upload/files/wisedu.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/xopupepiluteli.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/05d672fa0ba4764a236f149e9a21b8f6/93947362472.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/67676395853.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e0b0db894---wuwekorib.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/99637880718.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/7488617456.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/nulexobidazasotabo.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/gokasupi.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/2030553105.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/mv8qpc365nmtj71764udj35jv6/fejomididovigizezojotuwij.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/mepugusa.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/fexibigobireteladu.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/75551140232.pdfIn PDF document text
    • https://unosms.us/userfiles/file/61748739415.pdfIn PDF document text
    • http://hexindechem.com/upload/files/42101418820.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/46591466032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+conjuring+the+devil+made+me+do+it+openloadPDF 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_off0000f3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FC 19372 bytes
SHA-256: a480243cbd98d4b4920b3dab706330acc64acfc531b46286accf4b4d5a8088bd
font_01_sfnt_off000126db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EF2 11052 bytes
SHA-256: a62fb8bc25233ab1b6b7639303e9f6e8dc0322ec689e9478f2a0a8c172efe544