Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fcc94db61fddd20…

MALICIOUS

PDF

82.9 KB Created: 2021-08-30 17:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 60180575bc2ec19b306f212687152518 SHA-1: bbc8c6095fabe1ed3c110a4f61b7acb5391d8c38 SHA-256: 4fcc94db61fddd205efa53cf9d0afb99d15a9402c1f1f4bbcdc81cb01c23691f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. ClamAV detection and ML classification strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and URL patterns are consistent with exploitation attempts, likely leveraging embedded JavaScript or other PDF vulnerabilities to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/aci18kn691q25ce62fie3oth6v/26290050248.pdf In PDF document text
    • http://color-gateway.com/userfiles/file/31984798571.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/kolatalerenebowogip.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/zifetupiwetuve.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/0e5ca9c7d16319022f36fc929066ecc0/2096036137.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d96bae48a---neguxo.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc2a5c774c---muguximupozizabozad.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jccmoo4dte6at7afinia85ipq1/tilobuwivelorofade.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5gqrgmtpocgcg2rugh5m3as2g0/88241432757.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c2852da0963af8a53591f18d0a5d136b/24900414662.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609233818644d---58901133469.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae7fb3a63---xugelovevitagod.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/puniforegaketarepeketuwew.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/gs3crfkb0vf1untfqkipg2vh5c/3713132408.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/wemef.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/rotadilu.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a19b2f4dc13c88a9cccceaaf2295175a/80493138310.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/c95e2b37d8b03837009b75230c8a73cc/86795671394.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/fozodowasalakosofudu.pdfIn PDF document text
    • http://rjt1.org/upload/files/760283609.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/54574419223.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6d7e8e3c065b948e077f2dc40aab9fc7/dulutidaroli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=which+of+the+following+statements+is+true+statement+1+a+parallelogram+is+always+a+rectanglePDF 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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 11272 bytes
SHA-256: 441c8871397ab0d01c157491dfd6e99655faf5c726950c8ac004ac52c845ac43
font_01_sfnt_off0000f55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 18584 bytes
SHA-256: 48d9662d8c116b61b5cfccf9f50b1cb836c6b90b3d3650492069b366c5f7aabe

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