Malicious PDF — malware analysis report

Static analysis result for SHA-256 532d347c1911e8c9…

MALICIOUS

PDF

99.2 KB Created: 2021-07-04 01:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3e7dfdb0c0c2476d4738520d80d14ad3 SHA-1: f60b0c9d1638f33958cc4c4a28aa54f4e5f096f5 SHA-256: 532d347c1911e8c914638c022d6787e4c8fc2f85189d5a4e5e255d6a3e8c65ba
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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
  • 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.
  • 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://kstarsmall.net/userfiles/file///43520898222.pdf In PDF document text
    • http://erdivigado.hu/userkepek/file/nasotumorafewukawis.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/9727ee0dd0ac998b0a359a280a94712a/sigisesilipuvetefewexu.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/96cce71b254ec4fda32736ed6e255b34/lariwofezesujemetez.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1598e28d6221f478e87584e0ed175985/xalarutawajovodifel.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607633974692f---96061566763.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/0b01501fcab50b161f9e0d6322b79f6d/19314467898.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/q1e6rp4qvgc4kavbo95o61pk46/66423930101.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/9a4bdb7fc03cbe667669a686b0191651/37305566454.pdfIn PDF document text
    • http://tcihk.com/userfiles/27326195178.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/dosifubikinetamog.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/11136484731.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c483d812e6---wenuredifi.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/49641229925.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/5304244123.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713afb1cc5c---57067785842.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/c37182b6c8c8aecf7a644dc3b1416cb1/natesi.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d480162a5039e0b35c1ee56407b57a4/87800551228.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/353dfb39bbb6c01cacee589ffaba5540/15918215240.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/medimogeduxikexoxatika.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607559b07d502---xudowuniwagafiwino.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/g17ppt4hvj0rlhq9l1r0mlb9q0/74775420090.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/62ae1c02d65b2cff2814bbfdf457367b/nusagorakonagemejaku.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/49eb658e842e98bfbb8106274bec3748/82131690248.pdfIn PDF document text
    • http://allycatering.com/userfiles/nowadumenav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=duke+of+sussex+meaningPDF 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_off00012177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 17604 bytes
SHA-256: 9196e37ad3c762c96dcb95cda005e827db7ddee12ed6edd9529b1785bfcd783e
font_01_sfnt_off00014f0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F0F 10608 bytes
SHA-256: 9f1d6d8c8230125c97888acd76628d8675017d8a24a83f048c188181f873034b
font_02_sfnt_off0001675b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1675B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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