Malicious PDF — malware analysis report

Static analysis result for SHA-256 b394fdb30992c381…

MALICIOUS

PDF

80.3 KB Created: 2021-09-24 10:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af56138e41aecdb84d61fc3cbe97930c SHA-1: 16dc8c69888c2b165b11615adcc33f6442decfc8 SHA-256: b394fdb30992c381053c7314f860a9f618cc0ace679df01b957480f3366f9379
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external URLs, some of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download and execute a second-stage payload. The presence of PDF_JS and PDF_RANDOM_URL_LINK heuristics further supports this, suggesting a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://mtdind.aicsmindia.org/ckfinder/userfiles/files/vidojivalapitexesizozojo.pdf In PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/19201774393.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/89309966239.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/kexelezoxurozivivezalaw.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021091008292473499.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b856197b32---fivojexorusa.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/12718632882.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/87150292310.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/mububipos.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/mudikigupur.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/62504552724.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/51726019374.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/lokizaxanoba.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/81974029773.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f19ac1f283---zukevurijopub.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/vuselokelozugavolupevore.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d109ad9f22cb9e6c5ca5267f9f313eea/14417968820.pdfIn PDF document text
    • https://alkoplast.rs/files/82164859561.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/bawalikapelupiwoxurim.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/zexiwiwaxugaximod.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/d833b8e28d326e30b099e2d565a85079/nidewopulelo.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/sarazuwigu.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/jodibeg.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/82831937631.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/2472109651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=teach+yourself+bengali+pdfPDF 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_off0000d538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD538 17392 bytes
SHA-256: 42b533efe8fce8cde709b1e6f1973904d1a4c8756783d400f039b8f3485e66bf
font_01_sfnt_off00010267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 11120 bytes
SHA-256: 390dbef9a59e584d9d0dd162fdfe32a995f2c44e3d5edc69791d56ef24c95b57
font_02_sfnt_off00011bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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