Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d4885259854fdde…

MALICIOUS

PDF

163.6 KB Created: 2021-08-08 23:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: be967459599f39063ea1580ee9ac4ec3 SHA-1: 5072c188dced7d26c8761c484b28e4ae3a39cf24 SHA-256: 4d4885259854fddef91593e1b43fb252d41fc451780e793faf5747e948a2b900
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://leadershipcareer.kr/fckeditor/_upload/file/50481666002.pdf In PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/pp6u4hkagie6bi7kevtohch70u/fujijotikitar.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210611024249158.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/80370477175.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c209a9e5c4b---sisereririlukaj.pdfIn PDF document text
    • https://blv.by/upload/editor/files/kaxur.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/983a3748f9dfbb6c39642383c71f49a4/xefugexerasagofukotore.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cea424d8b4b---fufivevagenumajemidoga.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/lidove.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/wijum.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8feb176b2fd0f8bf05df588528e6653d/38936686767.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/nizipuzetasopewimo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9a797ee2793020a00c7c140e0158bb35/zufin.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77085a1707---41106150540.pdfIn PDF document text
    • http://prestopc.it/upload/file/59338544428.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/raxogogebonomew.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/gifuxedene.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/80207697691.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c3d1575f1f7bb162c9dae1d90352b0f6/52595129084.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/1577636669.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/sagisu.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/002b10685967eb2dd9ea7df000d12d77/lulalinononu.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/rugurixusolibudafo.pdfIn PDF document text
    • http://jar-ted.pl/file/30767714484.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/f8cc04a335141c92a5116fdaa7970329/jewunatus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=glencoe+algebra+1+chapter+8-6+answer+keyPDF 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_off00021d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21D42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23559 11492 bytes
SHA-256: 0b8b66f8abd8b8c36f5925d23d064b99349ef8cac7d9e4373c879c8a64d8941b
font_02_sfnt_off0002507a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2507A 17776 bytes
SHA-256: c5e8a1e823535d698e7b96bbbc24d2991444596f643ac77bdf2e495dbef7a604