Malicious PDF — malware analysis report

Static analysis result for SHA-256 530c3b2a3c65a29a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 17:30:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ad6fad440df7762ed0b910f6daa7ed52 SHA-1: 689b656dc7bb0f74c0ed39aa44d8ec9d08baf0b5 SHA-256: 530c3b2a3c65a29aac3e8c2386c647887b9202906639e161bcd7c35595d9afa0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. This suggests the PDF is designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cb716afc3---pokuzukerubexamiwatutow.pdf In PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ukjrbaenlklv86htvqim13hov8/85121233190.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210725033533.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/zajitu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ebe2c04d86---78426692973.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/21011375250.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/1a60198a4d0175fdffd05fe8da559f39/69955675031.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/60088767144.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/96311869354.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac47aa4b95---wujufutofisezoseduxo.pdfIn PDF document text
    • https://avenue102.com/uploads/file/lorosaxuserubefumaj.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/16479956048.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/c5c132ded772e8554cca899b8583be6b/vukijimu.pdfIn PDF document text
    • https://go2germany.ru/files/file/32382663725.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/savidogunefenivu.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/5gmdl0nqnjffb21a9hsp877if6/6056682505.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/dd1e8b5f065ae7acea4fa1568b3488fe/xipobevonuwaluwilemenegif.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/jedaputivibijupixa.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/zezufipozefikufizow.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/dotonewosuluwi.pdfIn PDF document text
    • http://dongduong.net/Images_upload/files/jigamuzew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+duke+gaelen+foley+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72C 10588 bytes
SHA-256: 7331894642d21df42a67aa4b43b67ed8e347b6d78945bcb72c4d3fedfb1eff90
font_01_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 16092 bytes
SHA-256: ce900dfedafede039bad39cea2ac5a42d610d3c6ba0ca92259ab3c5592aad278

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