Malicious PDF — malware analysis report

Static analysis result for SHA-256 37234ca5aad805ea…

MALICIOUS

PDF

88.4 KB Created: 2021-09-12 00:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 52e3df610fe89d82967210ed93a86810 SHA-1: 07f1386256c5eda83773a4f2cb323c419d8fad94 SHA-256: 37234ca5aad805eac78a865465ffde1ec945f5b7a0a1fc674951000949f50189
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=coolmuster+android+assistant+full+version+free+download PDF link annotation
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ef1bcc99---3479090782.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/84276984251.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/73328684886.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/sipipufumevubitigufek.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/64524579424.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/2444556847.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/40001578333.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/sanoranimez.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/63661885174.pdfIn PDF document text
    • http://arsvet.ru/img/upload/11619577222.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210903050103.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3hm04avfthsgb2cavtv3tfrt5n/vuvewimexa.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ebd9606a0---kelefirabug.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/moliruradodovozik.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/69967961858.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__612EAF222F87A.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161327df90bfb1---nomepekilowov.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613590bc930ef---34772470461.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/vupufedexinexat.pdfIn PDF document text
    • http://dges.in/userfiles/file/91498156780.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbd4c64660---60499770897.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/44296466903.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/lozopem.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/71247608976.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_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 17592 bytes
SHA-256: 5922fea1d2591750174e6ca63584dc902f45b57f7e41003443ce176b686a5313
font_01_sfnt_off00012288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9F 10800 bytes
SHA-256: 83ad4b6d84b1dee83936dbcf4f3f498110163dd7135a06d11bdc1a213a92bc1a

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