Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d9621806cd8896…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 08:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77af0d4fd9d4edad1ff0a691fb5bdd61 SHA-1: 1ca14ed4ac31300fb04008f37800a5c643fbeb2f SHA-256: f0d9621806cd88965d051a1917b740a2342ac9f8b7ae3db2c218ee3ed027623a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of numerous external links, many pointing to compromised CMS upload directories or disposable hosting, indicates a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and contains no readable text, suggesting it is primarily a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.corazondelsol.es/ckfinder/userfiles/files/97085361433.pdf In PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/muzezilutek.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608264550ccc7---tonikunojut.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-12/20210512103243685253.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/53353500266.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/viwukanepemuzafewesulamuw.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/divururesaxobisogima.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/94a330d7bf979dafb0331b5bf3f8f8e5/85576261306.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b21ffe3524f---43768052275.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612bdc2e6be7c---nijelirupipidas.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/gagituxolowej.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/99158914851.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/fipamerilonolebu.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/wumokajob.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/nidimawenit.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5100eaa222---98499688882.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/fiderogisapa.pdfIn PDF document text
    • https://susta.vn/userfiles/file/67563119065.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161178e589a436---98988317926.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16117b20a24141---sapat.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092e19c4f75a---jugeribuvadamepodode.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/4408ebe8e4c37c57f0a2b8bafd0a4877/kanuxapanadim.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/nebojugapud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pembuatan+pupuk+kompos+dari+kotoran+sapi+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_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 17180 bytes
SHA-256: edb605e907edbc559e01c22ce3fa733cf6a079dca2e49255be958f35e5a7e3c6
font_01_sfnt_off00010357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6E 10948 bytes
SHA-256: c82e8b39f964bde99c5307a84db926a3f41b5715a55e892fb8f12bf8539821f5

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