Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b4323cfd8159907…

MALICIOUS

PDF

100.4 KB Created: 2021-06-29 07:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44350349e2630fef262648c3af715dfe SHA-1: 8b8f06c33445edcfd56a187a78ba66d0187980c1 SHA-256: 7b4323cfd815990787d731f53e0f57c117020ceeea9417a87686c968077d2e66
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous links to external PDFs hosted on compromised websites, suggesting a phishing or malware distribution attempt. The heuristic 'SE_INVOICE_LURE' indicates the document's content is designed to mimic an invoice or payment request, further supporting a phishing attack pattern. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://polymer-optix.de/userfiles/file/61192643306.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/0038efd923f043981e5f0536004a580e/fikakub.pdf
    • http://fipjp.com/userfiles/file/kavuwuvigitikivenete.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/nv9c07djb1r9hn59cl9l17dsct/meninukaxalapi.pdf
    • http://mai-colle.jp/userfiles/file/webonamuwupixonevar.pdf
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/47827477721.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/n3c68a2ca1gap860647uos134m/fuxorelomozamakox.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609695a3cc36c---40691307755.pdf
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cbdb7a3f8---27221746504.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3436131285---21961780252.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/3bd61108a4be85b1e5ef419981996b4e/87710454226.pdf
    • http://nuestratierrapremios.com/campannas/file/54581757856.pdf
    • http://focostrade.com/files/20210620065212.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/44e650c5c89f5e88eafa75f712273f0c/80383460518.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160988a24b4c17---vives.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad3e779cbb---riseronefexuw.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960f5165326---vujotu.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948074de3ec---kupos.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160837c89b1c02---soxakeromuxedamirela.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210528144953.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8aaf7ea973---79609547817.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160795014ec6e4---torofevimimulor.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608434ad1df97---5409844645.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a46240155---20735245136.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sapphire+secure+register
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000125ee.bin
7c95e361971f6bc5e0d6c736b1a5ac074d9225435b24b87ffba296d3a503689d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125EE 10560 bytes
font_01_sfnt_off00013e2b.bin
2992ec3693b10c26943e3c6c466be64be3aac77f7a551971c97ddcc95749d0dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2B 17536 bytes
font_02_sfnt_off00016c47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16C47 16792 bytes

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