Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7be4628029dfde…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 21:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b51deb561336e912ea237bad6ebc1bb3 SHA-1: c370ef4e84ce4501264d029f3acaa7a8f142487e SHA-256: fb7be4628029dfde7cfc02b26e9ae631919e929f01b6320112e41de78c3d45b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pomocnaukowa.net/Upload/file/47444655374.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612d3e2037d82---71953179812.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/rejetesanixedamazukilet.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/riguju.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/do9shsb1v5unck7jini313smn2/mulur.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/pizefadog.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827596063e7---45508926978.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/davebiwozofal.pdfIn PDF document text
    • https://troypin.com/calisma2/files/uploads/57214394314.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021062304483373499.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/tobofusaga.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/5a0i6mvr7gbbmtvfk9vp98f67o/36142654844.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085618fa1011---javisal.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e20a80bc828---18121306512.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-16/20210716084311981886.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/wibamisodipanajoro.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d51c1dffbd---xopunuvoboritekotasajen.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/82869394959.pdfIn PDF document text
    • http://mimpishio1bet.net/contents//files/93705275456.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a00f3428b---49510355494.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088b72dbd55b---58277066769.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/sorovigegoruwaleja.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/sesizejolimatosimifago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=kinematics+pdf+grade+11PDF 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_off0000d7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 10840 bytes
SHA-256: 1cff12ec70c336d773f99da8913455933c41d9fabcf78efa0a0e7633e195ecd9
font_02_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 19224 bytes
SHA-256: 373b4b1fdeb0efdf3ad7d30baf02550007878ea1fa5fa972a33a7692ef7601be

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