Malicious PDF — malware analysis report

Static analysis result for SHA-256 4849a2522b68ff24…

MALICIOUS

PDF

81.6 KB Created: 2021-09-13 09:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 841280d7341f93aafa1e69939e83bfb5 SHA-1: 704601c65c6df920806ebae02002d650795cfbd8 SHA-256: 4849a2522b68ff24c433181dd8fcbb2cabaf6bb099545b86cddf91577a34f670
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs, some hosted on compromised CMS uploads. While no scripts were extracted, the structure and URL patterns suggest it's designed to lure users to potentially malicious sites, possibly for phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ubest.ru/images/file/zudumelofilijapixakuka.pdf In PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/99656536188.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/disapuga.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/79573885587.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/55824314499.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/kowoturodefagonifolanofuw.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/zeruto.pdfIn PDF document text
    • http://didula.com/img/file/95352167906.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/95006677629.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/99899317305.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1250eaa1---vijiwaluvobixagesisu.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/gikifepodak.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/e55f0eba0787596b15a35c3de0f47215/7594046999.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/54225042059.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/kufelitogalozenuxid.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/pogijok.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/72280660691.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2c1590fe6---jesusowufepimisafodesaju.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/16155171189.pdfIn PDF document text
    • https://ms01bet.com/contents/files/mugokokigovegurumo.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/mozunibajefaf.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/fimobabikorosabowogigar.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/62299342652.pdfIn PDF document text
    • https://iwistw.com/upload/files/sezekedovo.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb331e92da---83348504756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mod+ultimate+car+drivingPDF 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_off0000d8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CE 18144 bytes
SHA-256: 6b6d01a753d95cbc7a3acf6b656cde492d147b589de4979dd16b6c63cea04f3b
font_01_sfnt_off00010805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10805 10704 bytes
SHA-256: 9c964ef9045d5a442e4288576410f18fbb9336178c6ebb28666bd10fea7f0367
font_02_sfnt_off00012057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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