Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f435e2572a095f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 11:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4e00133e2d45c91fceb843e06e4239d4 SHA-1: a45a02e2051fe357e2409d7de82bd04c1d4d2818 SHA-256: 63f435e2572a095f5ef88ea7d6d2e800cf3388127f9f376fc06a70a6aef9d0bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, likely intended to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to download further malicious content, likely disguised as educational materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7f65eddef---wonowumorevi.pdf In PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/liopuei1uo49vlchc125h702ul/luvuxekosifukal.pdfIn PDF document text
    • https://medtek.vn/storage/file/65141725132.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/75969552744.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/suxewuliwunuw.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/049811533f0627b7da22a453b400c3d5/6714867142.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094680d28d14---35180768098.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210629220223.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b575ef3f8b---dowapabafimi.pdfIn PDF document text
    • http://goref.ru/files/file/felofagemuzijus.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/basofewuwexujobogivim.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/vudelajaze.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/darirunokin.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/45696599393.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/33487315267.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1624814054.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/pvnfus1sjlabta353cbu543mvo/munurixomi.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/17039785333.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160875035d1583---rorukefonotokeboxefi.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082becf65898---juzusogiripudevemisifat.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/2874384312.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/91727034042.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3beab9d44---nikewatoxedaxa.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/77527846251.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16125b033c0d4b---zefajugaxekonufonuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=english+learning+books+in+urdu+pdf+free+downloadPDF 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_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 17508 bytes
SHA-256: 90bf572750d5190970aed60e46e6fa322c1ca62f8473577f9458d07113051e38
font_02_sfnt_off0001291a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291A 11080 bytes
SHA-256: c4714623a86480f7c1be4061dc6ef632ebdaa22ab36f25633a09f59ca8bba358