Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c617710a5ca6de…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 21:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 373b1622060c19cb1672cebfa44024e9 SHA-1: dcf706685ea50523262d5a5b4f1d7300ee2ea043 SHA-256: 38c617710a5ca6de0d8fac5e440d93dfc8dbe5a5363eba17d7bb3dd4e4ea68dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://ohadalegistrocbarter.com/ckeditor/uploads/files/66841839624.pdf In PDF document text
    • http://milkyway-vn.com/upload/files/fuxid.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/pexeliwonotukaze.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/52979563564.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/nijiluromejo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16140e4f83be33---xezaragesemisogi.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/xaxipolurak.pdfIn PDF document text
    • http://xinnethk.com/userfiles/file/vokoxakuruxa.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/25077938641.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/54059107676.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/vabir.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/3jn1u3ogbektaiur1ke2g85s6c/kemaxemukopetupedegob.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/74234152683.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f13b37214bfe87516447bc23d3deafe2/pusij.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/18547117848.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/12397499296.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ffb4b6c59d---fikozif.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/39661334489.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/dawasaropevexigutuwilaka.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/milometijokozu.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/gujexavipuxevolaradoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=game+yugioh+tieng+viet+cho+androidPDF 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_off0000b081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC898 10924 bytes
SHA-256: b9b240e1054e775efb4d27f8a1add6dce828ea67a1224396abbb1583c6736a04
font_02_sfnt_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 16744 bytes
SHA-256: dc5dfd4d2a4629e7afa0e9f7c1cffae22e734bec165da48d042c633f76528ae7