Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d321bedd93984b0…

MALICIOUS

PDF

90.2 KB Created: 2021-09-04 19:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b4d699bcf5f016572ec94d9d1802fe9 SHA-1: bc000ba3bf336832811df91adb8464a14c112f3f SHA-256: 7d321bedd93984b033f75f8c53232bf0ba20840e27d784cc994e397c96f5b9d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to execute the embedded script or redirect the user to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/0a7fb571c492c8665f3d467adeed851d/40794403262.pdf In PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/fc13ccae5f7b3cf3d3115b5bdfef5938/nezutuwilasoxejum.pdfIn PDF document text
    • http://sushi-belovo.ru/files/rusovuriwikitoxomuwi.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef5d9de31---32532497593.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/93827838594.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609be61bd40c9---22130472646.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/firesabejiroxe.pdfIn PDF document text
    • http://vkp.ru/upload/global/file/13513647898.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767aff9beb0---sobiz.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/xiganadituraviwumivo.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/ratuzu.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/jamuja.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/pezunok.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083428680a8e---90468267822.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pjtbnglq9gqsvdum1ag1s7mcoj/tupodu.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/56684387812.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/59111202148.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/c4e350e0219718f5dc058120fd9f685e/6359675090.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/50863274753.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/97022266810.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911c6af1b78---gubedesonaravezibodawiwo.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/janulemoxesipujasonejeki.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/92299032549.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160815958c2979---rejesafativibomobidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=trials+of+apollo+online+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_off0000fc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001147d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147D 18592 bytes
SHA-256: 32dc06ce86fb70995d8c9f1e40e97931c344289bd9cc17fb25ee0fe4e065b544
font_02_sfnt_off0001443b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1443B 10356 bytes
SHA-256: 0dac4b92a102e5676e401967fdcbbfcac4eb20c751c7be750703ccddaa3de741

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