Malicious PDF — malware analysis report

Static analysis result for SHA-256 760c61f15370351f…

MALICIOUS

PDF

73.5 KB Created: 2021-09-16 09:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e727fde3654969f0289384f4ffdfef2 SHA-1: 66b58fb8355cc21af33fe9e03e87db7e9947e049 SHA-256: 760c61f15370351f13d49bd1dff610a87f285f9ba12eb08e65cc9d84c37c7d30
156 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDF files hosted on various domains, many of which are flagged as link farms on disposable or potentially compromised hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. The presence of external URI heuristics and link farm indicators supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://studiobaldizzone.com/userfiles/files/54569561055.pdf In PDF document text
    • http://galettedesrois.hu/userfiles/file/bejixidikopa.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/19611734855.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/85649262648.pdfIn PDF document text
    • https://derfo.info/resimler/files/woxagepuruxev.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/40749987048.pdfIn PDF document text
    • http://eichler-kammerer.de/22152341899.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/77327091260.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/kelisefug.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/25673241208.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa66c24b1---fowunigipewowa.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/5u3p37cokd1vo8sdghuqrphsv3/korovinapom.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135bb1209fca---veboxijawixezawidira.pdfIn PDF document text
    • https://tckontrola.hr/files/wafizudanogixu.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/44806671625.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/33664287085.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/neterufebederojexusuzare.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/39318822504.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/gilajikudonatobareteve.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/15711154092.pdfIn PDF document text
    • https://purefeeling8.com/data/file/jekuxajem.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/78775078141.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/zarimij.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/47079753336.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=vidmate+2014+freePDF 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_off0000be83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE83 10416 bytes
SHA-256: 0317570a70bdf242a0e4115de6e16f3ab2a5e695babeace14b6477087207341b
font_01_sfnt_off0000d639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD639 16532 bytes
SHA-256: 37c40fdc3469c4d820c8208c9619a8330e83f49ddcf8e1d278bc7db9f57a0f49
font_02_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1