Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf9bd86c6903db4…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 22:14:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fab45b04fcee01083cd7cf856999e673 SHA-1: be128abb9a313bd1c430762a8d57b6bc2381a3f2 SHA-256: ccf9bd86c6903db4c3ceb1ba588198bbee7d37e1ebe7314759517122b15ac1e7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest the document is designed to direct users to external, potentially malicious, resources. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://e-photo.lv/ckfinder/userfiles/files/47660293862.pdf In PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f57a01973---79916303424.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/tizazerodefixezasudij.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/65ec591c9144d14761afb19c63dbdafa/69497949036.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/xezuzawumilenugoliwog.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/78468439343.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/95815546740.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/xejozetifuxokuzirugapijoj.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/80380969258.pdfIn PDF document text
    • https://ibericadearmerias.com/file/57663799412.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/bolitesebikulilumigilen.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/013808136dbde9609bf81b4bfca51a66/88828002144.pdfIn PDF document text
    • http://standdominica.org/files/files/89851043881.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/52959028308.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/4617753124.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/59387902834.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/95567930970.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/pujesiwesopazutimoke.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/hjcqmv2kolqalig77v4lhb8ui6/jijavinenezeturabolon.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/xesarogolesomojapojagigo.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210902205805_871046454.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/tixolovobitijabekanir.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/kufilatekesezikamojon.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/repanakudoxepevi.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210913171359145.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/reruxefamifirax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=iphone+4s+gpsPDF 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_off0000ca19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 10060 bytes
SHA-256: ddb0a961510b7ace6976fa583495799a1f5cc4d80ff35090944d9c57afc9c1eb
font_01_sfnt_off0000e06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06E 17544 bytes
SHA-256: 7ea0dbde7ee05de5437865b523deef5a5035016b9c2319f3b041a12497caedf3
font_02_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1