Malicious PDF — malware analysis report

Static analysis result for SHA-256 d383925ef3359b50…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 14:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 187ef0162cfa0ed3334672c3af784d87 SHA-1: fea164862c6c5d677afe0bccae185ca06d98ea26 SHA-256: d383925ef3359b504c10878a89a196399e7c46d4370d413406472bab043108e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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://pekingtogo.com/uploads/files/puvififovozeduremer.pdf In PDF document text
    • http://rideabikenews.com/user_img/files/51528124910.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5sf370ps9v3fgmp253t33fosp3/sidaxavadapokefe.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/zepowapam.pdfIn PDF document text
    • http://scantech3d.com/files/84621349390.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/65530558698.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/79534145677.pdfIn PDF document text
    • http://capital96.com/userfiles/file/fozagajajufonulit.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/93041188107.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/51083442198.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf38d303b5---lazijuteko.pdfIn PDF document text
    • https://ancoraeducacion.com/images/wafaromepogarevonojomi.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/45754731334.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f061b40065---fimolemuwevazaxasan.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc1c53a69d---94111768425.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/xepukitepoganog.pdfIn PDF document text
    • http://usmleworkout.com/files/file/nifufadu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/aa9dc63319edaf6ad421cc13a3ba0146/5366499437.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/bogimape.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/wolutorututanu.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/32393279076.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/97817925080.pdfIn PDF document text
    • http://erictex.com/ufiles/files/17436017912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+do+i+screenshot+from+my+phonePDF 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_off0000aed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED2 14968 bytes
SHA-256: a2d7a86cafd1787b6f3ed45de7392a87aa7098f86ab688f77f2560c83f87a61d
font_01_sfnt_off0000d42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42A 10868 bytes
SHA-256: a3da501a3d455f58843ef8e442b1ccea8e38a94dc23bef954ff75fdb07c89cab
font_02_sfnt_off0000ed1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1