Malicious PDF — malware analysis report

Static analysis result for SHA-256 439e6de807a3a019…

MALICIOUS

PDF

81.9 KB Created: 2021-09-09 00:24:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e63b85fd99850db5377613442465bd0d SHA-1: 7934122fb9d59f5d5b2afb025e1cbf9547594178 SHA-256: 439e6de807a3a019fda2dfeaf7c24820dca74836828876238ee4fd3abdf9c31c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://df-foundry.net/d/files/58520777695.pdf In PDF document text
    • http://bwc.lt/i/31969909597.pdfIn PDF document text
    • http://dominant.name/userfiles/file/fodixotisexuxinid.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/bolupisowonuwa.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/sunuriwodefedesibosidava.pdfIn PDF document text
    • http://saaretravel.ee/images/file/67409703344.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/runoruwaxa.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109080625038463.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/xonelizetam.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/megapifunawukogebalaj.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/qrk6pkhihi4hor1g31bllv4f25/74711615388.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/72887023319.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/matupadi.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780b459c1e---89087592398.pdfIn PDF document text
    • https://oasis-travel.ro/files/37275214747.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/kudazakagumaw.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210909050803.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/71938031660.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/xewabutasu.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/newexujivutasejozurabono.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362bdcb9c3d---worix.pdfIn PDF document text
    • http://poiskvod.ru/images/file/pituporixebe.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/lugotajusoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=space+jam+2021+full+moviePDF 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_off0000d938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD938 18572 bytes
SHA-256: 8ab7bb6abdf136534cd12e7e81ad28c81f6219997f1d97f0216e9a8efc6e9c6b
font_01_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12191 10836 bytes
SHA-256: 19824b63d94e94be76549dae29b72d21c27433643c09dc734a8474e3a8fd1c71