Malicious PDF — malware analysis report

Static analysis result for SHA-256 47121bd2b54e2b89…

MALICIOUS

PDF

92.1 KB Created: 2021-07-24 05:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d7af6d735a4ef1df1b7eca38d89d0cc0 SHA-1: 9a20b96b87b401ee8cd6484e205b30d70b41afb8 SHA-256: 47121bd2b54e2b89ef35400eb0f2c65872d93869a0c22e87ca6bf9fcfb67cee9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings clearly point to malicious link aggregation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://greenearthgardens.org/userfiles/14326236092.pdf In PDF document text
    • http://aftckwt.com/uploads/file/19467438767.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/7e9eaf3fb82e57e01ee408ed20f15834/61257861400.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/89745225574.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9ae92791---fasinow.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/91750726457.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/43664700077.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/bae6d0f812c8c50b8a8e81e5a2a4ed46/goneromaboximuredu.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083732c2d17f---bibebigixifiwagikoserid.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160939f94951bf---67405575074.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/povitikodo.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/45357312021.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/zegijepufegojenilesefog.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/xanuwevipovokuvubuvina.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/74206915229.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16078bfdbaf0cd---lusijodibaxitidunisi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/3adfd9b09e2bb669fee55d33ae369117/vilumuluvo.pdfIn PDF document text
    • http://idaskitchen.org/clients/d/d8/d86ca706a5600d452cde81e4a21b2d68/File/pajudalezesamevipabuxiz.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/gekifesovopebupa.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2eb911a14d---setedu.pdfIn PDF document text
    • https://tavio.ru/files/file/durikukemowenakefefox.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1e4bbdcd09622e650b9dccbd8e9a8402/97052494987.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/segijigaxiribemepo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+get+money+fast+in+gta+5+story+mode+xbox+onePDF 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_off00010138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 17376 bytes
SHA-256: 98c4a29cf601a4f66b785c6edbab4b91a51e540a828d7c64632a478382535daa
font_01_sfnt_off00012ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14700 11220 bytes
SHA-256: 5811cc4065dcbc3f6f8a632d19fcb9f840d7f36b0beb5d1622e399f4d22276be

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