Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3592a1309cb8341…

MALICIOUS

PDF

88.4 KB Created: 2021-09-08 15:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2dbee45a2313023fc7d6b4f071419d3 SHA-1: 0e078a2f94d7813874335265709454c8982f2591 SHA-256: d3592a1309cb8341cf18f29814a78268f200ac37a770fb0541fdc099d772eb56
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. The primary attack pattern involves luring users to click on these links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://studioarclab.eu/userfiles/files/93051311118.pdf In PDF document text
    • https://manuscripthandler.com/userfiles/file/92861745628.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/netax.pdfIn PDF document text
    • https://telorgabus.com/contents/files/29449504831.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/detozu.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/91282183611.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109041627468613.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/1209077197.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/89512657935.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/45339773135.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/temufanojibuzoni.pdfIn PDF document text
    • https://sergiomauri.com/images/file/5903290174.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/63630885828.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/95973269787.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/ninefukani.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/rebawanumigodovimaburusub.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/miwewokem.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16135f8575af95---mituseweluru.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/dupudejedujubitajetuk.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/11362368551.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/78675824299.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16310877561865048395.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/26acf1ba368147399b129e78c1e73ebe/lalagebazoxipufexi.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613847df68b1f---jigovis.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/24599328678.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134c0f0c4058---zepilapowosuluzepilesuji.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/88946565267.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sandwich+feedback+technique+pdfPDF 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_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 18644 bytes
SHA-256: c569a67ab4e188d9a5711cba5d2067bc580b96ac53322eeb7dac0f6f1ec9465b
font_01_sfnt_off000120ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C3 10924 bytes
SHA-256: 88a630690bfd0cb9109413bcaf95b87861f574a84c4d0319389bb7cbbd8662b2

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