Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3efa59275e202b5…

MALICIOUS

PDF

103.8 KB Created: 2021-06-27 13:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2975f2c7d52245e426c4e34a2f820888 SHA-1: 6501dd79f5ed00d5028e06597c1798f368c4a13b SHA-256: a3efa59275e202b51cd63b425b854428d389c32ebe932dba9b850135ebafd730
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, likely as a lure for users to click through to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it's designed to facilitate the download or redirection to a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a162e6ae12---limebabiva.pdf In PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66201848035.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf03acb5632---54488375189.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca42785d50---kudiw.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4bde3ac043cc5577b243b11118829e76/24122767401.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/u18es76ffc9nnp05vore7u6ndl/vudekowavikixefekapejapeg.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210529230950993009.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097ff64d99f8---loniloje.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/tufakoma.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/71270419585.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/0u11mf5o3hdp63n0e1o4mqk10o/91052237999.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/67327233731.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/jtq9bt763757lvkt9q95u8q0oa/fiwonederilubupegevix.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/2s354qd2qd7c5t9lrnlrnls7a1/28186901024.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/5bc43c3c8b707ffff48364ee448f10db/44930099606.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096214732010---nafukekenitodomurepe.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/kodefijuxo.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/e26dbe46c46e3bafa80cb51e86df9ecd/83804118686.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/vo0hvhtehbcv9np5h79q92thi2/pifidimepepezopetezireb.pdfIn PDF document text
    • http://pi-consulting.ch/download/xibanipebuzeromenakax.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-28/20210428233223871775.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9vlf20nmhpjn9mcthp5109ro74/zujakuve.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/087ebffe2dd2a8a70b171c0f77463f99/86192755502.pdfIn PDF document text
    • http://simonide.org/userfiles/file/92203563393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gyms+in+sword+and+shieldPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 10656 bytes
SHA-256: 43dc24d9c9968351d67d2798062a3a0ec247f211d0548ab67302d814b9760f4e
font_01_sfnt_off00010cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD1 24504 bytes
SHA-256: 43f21ca3373b06fd07a3c93d5d24166093f1787bc1034d55b063a133f24d6dc0
font_02_sfnt_off000147a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147A0 7336 bytes
SHA-256: 671b35187d5146e45067decee7ef023e403889e67252b9f4fd997cee29013352
font_03_sfnt_off000160d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D0 16852 bytes
SHA-256: 1a051cefaae6a6d953b18deb457109988c4dda8d3a3a42e8df0102b80e464174
font_04_sfnt_off00017914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17914 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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