Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4c5977cf387a69…

MALICIOUS

PDF

87.4 KB Created: 2021-10-05 10:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d64d0b001ffc8447052a969dc887f146 SHA-1: 45b3eb6c6507fc5f693563cac0f63be02a557c86 SHA-256: cb4c5977cf387a69877e2e39d35a4a0ff9e40b11ccee31418f0636e0d12dd67b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=on+screen+3+student%27s+book+pdf PDF link annotation
    • http://chinahongji.com/d/files/ligaladakuleze.pdfIn PDF document text
    • https://grouptm2.com/contents/files/72524343523.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/vamibopipofawam.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sibonuvifafarifamekot.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/raturevegabazo.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/bekisikaloni.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427066d18e5.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/31731386929.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/16498544835.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/wegozisarejute.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9e4ce9717dcd12a9a3c5063068e06bb7/9291677400.pdfIn PDF document text
    • http://boki.hu/editor_up/62867257285.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/79970259318.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/55786956250.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/62711588550.pdfIn PDF document text
    • https://communitytreasures-co.ravebusiness.com/gbe/useruploads/blogs/files/26477488213.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/kajajawimet.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136e8fd8ce90---zapidoveveliwaxifizap.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/20139606886.pdfIn PDF document text
    • http://youil.org/userData/board/file/61836659853.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/nasazizakexunobowove.pdfIn PDF document text
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/vitogemaxozatoxutamevo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/fcca7cfeea2d9e7ec93a622352c687bb/joxutob.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e378abc36---11894270971.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9b4613038---89866143079.pdfIn PDF document text
    • 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_off0000ddaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAA 25836 bytes
SHA-256: 5d44b291617dd27c96ce252a168059c5021591f193a4c12ad78ae030f868c853
font_01_sfnt_off00011e51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E51 10876 bytes
SHA-256: e79593ab930b1ce7e32049d03eab9510184b7c55df6cbf303f7aa0b2bddd36ad
font_02_sfnt_off0001378a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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