Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5141dfc5c57bbea…

MALICIOUS

PDF

182.2 KB Created: 2021-07-02 14:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 82325244ddcec5ca53897c498d35b212 SHA-1: 44729d5e6677434d00fd64b1ec137646a7dd41de SHA-256: d5141dfc5c57bbea464dd2b0056920efcbe9e716a545086f196d9cbcbabe5085
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, potentially leading to a password-protected archive lure, which is a common tactic to conceal malicious payloads. The presence of multiple compromised CMS upload links and disposable hosting further supports a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ntpoqpmv4qag95mmtlejqgcb2v/66570666461.pdf In PDF document text
    • https://mmszke.hu/files/file/99469409481.pdfIn PDF document text
    • http://jngf.cn/files/file/74444277436.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/iqn1bciohdphejqcaujl929f24/70943390314.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/bulidixonekivufivo.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/josidelapemunezaw.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/85b7461fabf882088362552e925b3413/sowajivuwaberamaba.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zoruzovero.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/rexukemimu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vcah0kblt2fgehn7s20f8esbhq/86562788362.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/64793010076.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60CEAC6A7A370.pdfIn PDF document text
    • https://sbufficio.it/file/24717973111.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca29c5f03---31460559183.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/743543625609beaec631ca.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/59745721491.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795eae33cb4---32405394287.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/gasibuzuvofodanajap.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/954c61f4967c09637e9e0f32fe300a9a/53059252526.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a39fa46f8---zoxuzatimitop.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/14791102541.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/mejamudasiporapawixipi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=thirumanthiram+with+meaning+in+tamil+pdf+free+downloadPDF 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_off000269aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x269AA 10924 bytes
SHA-256: 2e9e18d292fe4f1e331637ef052a112ac1ed4d21e709d67941f7489e3a9394bf
font_01_sfnt_off00028296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28296 17652 bytes
SHA-256: ad043ad851030bde13ac2a3f468fb8e3a06bf0aef1c8b3bc4ac49261c1ddad77
font_02_sfnt_off0002b14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B14D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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