Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b105ae446d2a30…

MALICIOUS

PDF

87.0 KB Created: 2021-09-07 08:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e3975fde0650afa8f74a6de04a59409e SHA-1: e08cbaad576c940c976526de98054636b4c80037 SHA-256: d9b105ae446d2a30db9cd4bb40be0c1b01f4e5a1f3f6bf1401363272a911de5b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

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://cructi.ru/uplcv?utm_term=statistics+informed+decisions+using+data+5th+edition+pdf PDF link annotation
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/firifowefo.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/reson.pdfIn PDF document text
    • https://arendic.cl/files/90028777852.pdfIn PDF document text
    • http://poultech.net/d/files/kanekupigurafobizujixebir.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/54661960281.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/32535111815.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833ffa14aae---96026187500.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f28439bef---94712251479.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/gabesesow.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2b6a63174479c38326dfaecd22c14a9d/monolerogaxixatudezug.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/fakuraxevelolamijipiniz.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/47439869614.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/6885318746.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/5735908571.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/kumeze.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/dejozibofetajemixudit.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/226547dcdc7430608f54652be9ad98a2/judoniroda.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/077kid2a58jlrvi439ohp9v6m3/filatezisowumul.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161207536cabc4---vosegigiguko.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/bisakirisavokusif.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6db099e89---59906339630.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bdac82a9ccb---92558507886.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a730fd10055---53069997232.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/6thmnmvk7vf6hf9uafub9tv1d0/bekosexeguzixogedemomamaf.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_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 11332 bytes
SHA-256: cd5b66187b64cbd74a1fa044e6f7c723828a665ecdb22ac604b4cea81e124791
font_01_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B93 18988 bytes
SHA-256: 3670b3efa7f5ef81bc4f9d4300f9b86cfee6dcc1cd998f972edfb54f4199a1ba

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