Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a2a5c95eb3542b…

MALICIOUS

PDF

87.3 KB Created: 2021-10-04 12:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9656aaf8f0c37a350995fd0935f5aaf2 SHA-1: e543800ba3c003639c7e26bdcefb92679c78fcca SHA-256: 17a2a5c95eb3542bbb191883a8b68ff90b5c6e19a5194a41ac2b5e21c16edbf5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://sevinctekstil.com/resimler/files/zojezoxaxazipukametujij.pdf In PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/00917541e944ddf39fe090fac100e12b/84262311706.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/18948759782.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905143312693353.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614be4372eb95---94248166752.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/poxamanepuzafusek.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/75360471058.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/zolajuluwemejilugozuko.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/14717952332.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/kimofew.pdfIn PDF document text
    • https://megalight.lv/uploads/files/68282980927.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/8225156762.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/73031405619.pdfIn PDF document text
    • https://fishuntpesca.it/file/ridafapinimanaf.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/91515854326.pdfIn PDF document text
    • https://aayams.com/userfiles/file/16949526420.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/limevat.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155c4bd624c2---61808411455.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/luburenelus.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dolozepup.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/peduvujelarabeziwe.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/sineritijo.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/kamixepavilexedel.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/7145732234.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/nevamabosuboduw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=metal+and+iron+worksPDF 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_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 10412 bytes
SHA-256: facb50146825baa61fc845670d3adf0252374dfacef26286c51e274a2065a813
font_01_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 18260 bytes
SHA-256: 463d3a5a950e888199d138c00596b0fabab7d68e6b85af6739709f35899a6668
font_02_sfnt_off000137b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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