Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1907882db89939…

MALICIOUS

PDF

76.9 KB Created: 2021-09-13 12:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ef59013a63e833dce40247440fb852cf SHA-1: 5bdb89ea5370b3806175d16c11b915fc5f8a797e SHA-256: 7e1907882db89939a701af7ea28c378fe8a96f23823b81d4a16c4ce5abd77001
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to domains that appear to be compromised or disposable, suggesting a link farm or phishing lure. The presence of a link to a compromised WordPress upload storage further supports this. No scripts were extracted, and the document body was unreadable, limiting the analysis of the exact intent beyond URL distribution.

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://sovaimm.it/userfiles/files/90336671227.pdf In PDF document text
    • http://artpolyclinic.com/file/files/vabawikunadipebividojewa.pdfIn PDF document text
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/92606337283.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/61050627843.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/lasetuvijurexilobagenes.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/ririnek.pdfIn PDF document text
    • http://teifsepahan.com/files/file/zavewaroguxuma.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jrk03lq31do1abg2cugbv2i7i0/mebasabuxusov.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/76266313464.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/8974573400.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/venafibegusogebumigogav.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/tisonodirotojijumozugejos.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/66589156550.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/naxupevakajafalolisuf.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/57209954165.pdfIn PDF document text
    • http://devison-matras.ru/upload/file/41264312441.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/tuxawugewunope.pdfIn PDF document text
    • http://ibb-online.ru/f/file/sugasemo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613518cf25a4f---lubabixexawononowazoz.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/79372955387.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/degapup.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/sugegelopuvakibexixiw.pdfIn PDF document text
    • https://digireg.it/upload/24161099410.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/e77fd994cb4155431731240f42c3c96a/wipilefajijupew.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/29429646810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=avengers+4+infinity+war+part+2PDF 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_off0000c663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC663 10812 bytes
SHA-256: 0fe30d16a0761dc616b7292070fa3670558354d0b98d3fca19ede0630cf0d1be
font_01_sfnt_off0000dfac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 17500 bytes
SHA-256: 1e58f1c802074b4a10df34c7c2d24dd4c8c443f98ffa11c0cb1f74f1d440bb01

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