Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b23d00ddc8abb84…

MALICIOUS

PDF

81.2 KB Created: 2021-07-03 03:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cf405d81559f4a38f9c7f388947f0004 SHA-1: fca09d1e1c8d4ff1f618dedf5a52f099cb50fe29 SHA-256: 2b23d00ddc8abb843d674af88186c08decbfa9e3f02880827dd064ef6528a989
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress upload directories, suggesting it is part of a link farm designed to host malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade initial security scans. While no scripts were directly extracted, the overall structure and URL patterns point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://catamma.ru/uplcv?utm_term=scanned+pdf+to+word+editable PDF link annotation
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a60b0d73b---56936367703.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/kch8n378o8rqtudc5003lk61ts/90396876194.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086adf358982---wufomawe.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/36474313346.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/dobuzobux.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe3b0ed0c1---51676413336.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/lazajajewiredus.pdfIn PDF document text
    • https://renault-service.com/userfiles/jowon.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/tomijodebuliferutugi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608959451f515---zumuv.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/29378525570.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc7afbd152---juzedodotazixixu.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/wuxaxijarul.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160830486d3d8e---doraxenawajileten.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/af1657c95df703eea0fdc31666485f20/mowelavifirer.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/36456275534.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/masivegoxoxatanalerun.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/didamakunimogumep.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/lobov.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d2769171---20632720737.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/9dd5658de6f4d10e33df47c94339de1a/semuzomakipub.pdfIn PDF document text
    • http://zivotzaokny.eu/res/file/31965135154.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/bekanis.pdfIn PDF document text
    • 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_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 16908 bytes
SHA-256: ff970cc1d9556df07cf7895463dfd83ee681e088a28913dfe5a128072718d393
font_01_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 10744 bytes
SHA-256: 85654ff83367a4fc422d81cd612ddeb0b71ac3f616c49a425ff2dc64611e6114
font_02_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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