Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cc4ab0c6f1f0c2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 17:43:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 05e764536a7aa8b2dab7edf4f9f633a4 SHA-1: 11d36447092ed97584a3009188f04834f10e6d01 SHA-256: 22cc4ab0c6f1f0c281e08f1be2b2c460847de9ded67f79b598772db6607de735
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chieusangducphat.com/uploads/userfiles/file/lupedipotatalonus.pdf In PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/dodobukekirukilejazivupu.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/gisemetotinopulofijanaw.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/mutuwifa.pdfIn PDF document text
    • https://masukpt2.com/contents/files/natevejum.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/gogemepum.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109050103451653.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/jabeporemapokitu.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/zizul.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/zusubuzuginuwu.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/84522185654.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/17179308323.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/pawiziwe.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/25457034598.pdfIn PDF document text
    • https://ismart99.net/upload/files/62746797355.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/70313164244.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/51589690765.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/48cf4c2635dcf950f2cd86d5042e4329/tiborijirova.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/3136283585.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/rigitoki.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132bde7d1103---91283120203.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d123ceb7c---90771770963.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/h8c4kbj4rehh28oo7ul7ncsoq4/25936787966.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/nutekevulukazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sonnerie+gratuite+portable+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_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 19904 bytes
SHA-256: 8a71bf80f9465f60e680da4101f6b6bc87f298471c2930fb64f6a14ed2deb7ab
font_02_sfnt_off00012348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12348 10716 bytes
SHA-256: 654839a6b17470a73ebc8ccd214b4be214fcd1caf13874a5e18206af0bba9c7e

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