Malicious PDF — malware analysis report

Static analysis result for SHA-256 69e45ec896bf30ff…

MALICIOUS

PDF

84.7 KB Created: 2021-09-13 21:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0fba9f1cdb5b1b52922dc9db2beeac98 SHA-1: 8a012af8638ebb0e2fb31c2560bbc003f79809b5 SHA-256: 69e45ec896bf30ffb5b1bc28a7a0f94b93b6174c0e26d99ad4a3fcf10be3d2c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it functions as a link farm or redirects users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports its role in phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://infrive.ru/uplcv?utm_term=porter%27s+generic+strategies+are PDF link annotation
    • http://winterwonderlandzundert.nl/uploadimages/files/memogerosen.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/21455098192.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/zadejotozosigalidivupudu.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/41470168561.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161323d1512d45---sewomila.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/rokozelenetibosa.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/lokoj.pdfIn PDF document text
    • http://studiovalentini.eu/userfiles/files/34144678927.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/kipirizuwukotolixakapisow.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/77698483353.pdfIn PDF document text
    • https://citronel.com/userfiles/files/guxirewalu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/056861aa27ba784dd0ad01a2a9b8dd43/38999115633.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/duxageralewipat.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e915a649c1---36666593752.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/97655222874.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/wanagavevijujunagoxewino.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/57473103256.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/rapofijeg.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/16700504470.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/tovakexipapedovotamaj.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/xaxun.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/17239399198.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/99521623292.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161377c2e1dcbb---pajimexulaxite.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_off0000e548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE548 10396 bytes
SHA-256: e1659e74fda49cd12b89f9ac172d81358b24d3b5567f1ee35a4fa82590e4ba63
font_01_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11519 18344 bytes
SHA-256: ca4194ea90cfe47384b242f8071f510650d8b445dc3996855bd52bc7424521b1

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