Malicious PDF — malware analysis report

Static analysis result for SHA-256 8466fc7bbad19797…

MALICIOUS

PDF

89.4 KB Created: 2021-08-07 22:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5682ef9358efb0c64738b9421dd49325 SHA-1: c6ceecec0dd494fbfb0b956df6af95180325c472 SHA-256: 8466fc7bbad19797a71dbc0a572335443366582c7f61384cf8879cd4f0438f30
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file exhibits characteristics of a phishing lure, specifically a fake CAPTCHA or human verification prompt, designed to deceive the user into executing further actions. The document contains numerous links to external sites, many hosted on compromised CMS uploads, suggesting a link farm intended to redirect users to malicious content. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d242d681a80---nubenivetasexe.pdf In PDF document text
    • http://pekingtogo.com/uploads/files/10507553550.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/mejisusoru.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70675dcb28---92729459226.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/0e478fe2d1b077adf299cb2bb6a5d814/90653159294.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/jetuwabukag.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5d6ea9ps48v6sjt6q3qkgbcpp0/sugatujefuserunelajudewo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/5fgdnta1p11kldsu7jg9d4n54i/82862408274.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/34760198713.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/04e6da984ed0108f5fda434614cf05fd/23300288454.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/8606f9e6e7d4b459e9c0b5fdeb43974d/26869371627.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8d056c5b---kajos.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/87q5fnkg4fjl2m6fffhmnq3usl/vuzedemijitonafo.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/pejiwowunilusomixik.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608901d297a25---sedevorubasugirogoto.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fabb3f195f7---muvobikowaluwidekariso.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/vazeludutazivitoguj.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/q0j4t5jelftom3uh7ble74s34m/43081037362.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/fixopokopesutifavitipudiz.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/29265744393.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961f87244a8---winijokimorukiputeguxus.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ee23b8a17---xuzifupatitirasanubipimun.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9962cfb72---90646776703.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/vezazemuremorebajavol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=is+summertime+saga+available+for+iphonePDF 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_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 17680 bytes
SHA-256: bf6e26a6e60ba6793124473a8d0ead12b6c3eb9228f8df3f246d1455fee6b683
font_01_sfnt_off00012569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12569 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D80 11064 bytes
SHA-256: 4b73c5aa5a7a14205d36478e09d2d686143a78f0013449881858ed8b7bbe44f7

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