Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c1d78687e12e6df…

MALICIOUS

PDF

87.3 KB Created: 2021-09-07 11:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b70db93ee1aae0ce65a82a1a36a3234e SHA-1: eab9dcd675252fde56dfecb18005a472ca897d32 SHA-256: 0c1d78687e12e6dffbf945ddd124a2fa38b383af479dda869fc43d2101e5a23a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, a common tactic for phishing or distributing further malware. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detection confirms its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

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 https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/njl6c9lvp9nud6gmtj8a6fv9oa/49021279715.pdf In PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbf1bc55a58---kodel.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/palafarufabirapese.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/lufipinimovunoza.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/bukazikuxadexifovejuz.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/visiji.pdfIn PDF document text
    • http://tavio.su/files/file/wujetatamugilukajope.pdfIn PDF document text
    • http://195exim.com/datas/files/81825999246.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/961294410.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/pekimi.pdfIn PDF document text
    • http://agriturismofattorialucciano.com/ckfinder/userfiles/files/29822119147.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/13331410966.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/lofaweselesamowevurolew.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/96375914582.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/cp173v92v10sef93p9i4r6qcgg/xusaluzitivafinulase.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/78716069161.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/suxesemuj.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/6729798784.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/nazeji.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/a9e029da3df26ab0bcf16927eda10877/89101096513.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcfd7c13285---59363936001.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/keragixuvabizifatixoxok.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/makuwajomudawuz.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/181530d917a1097b606a28c43007a3ad/nanorore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=amendment+370+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_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 10296 bytes
SHA-256: d5cf6f4dcf7f29b86e2dfa31f6eaa9b240b0295c38c2ac624eb88fff8844da84
font_01_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 18288 bytes
SHA-256: 043caf05a1beb65e3c0d76a9c8a4ca3da1a1a338a33de4711af63ba222d7f831
font_02_sfnt_off00013789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13789 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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