Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b94e9f130b3056…

MALICIOUS

PDF

105.6 KB Created: 2021-07-17 11:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a7e715d2be66e0bd294c5e44ea1314ff SHA-1: dbad0f4f2fb3369a996e278fdfed625cca06e354 SHA-256: 33b94e9f130b30568deec418bd12f1e2b95df3400ace9e510432691fc54e7f19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links, many hosted on compromised or disposable domains, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering tactics to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/t622aaisnkp8bd4aa4mj439o8p/guwabatimevome.pdf In PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c7d64fe0a908158fedca81b946eee849/wofunupuzemixaraxutunax.pdfIn PDF document text
    • http://suecoop.com/UserFiles/file/43953501460.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3dff23a836022d354c864b927fc2611b/87635513289.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/3a1ca24fbb837aefd1adf6732cefdcab/56655242349.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/mukusukiboxagebewabevido.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7966649862e8128afff790c3c968375b/vatiditotudovule.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/bodotuwun.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/6glmi25vm991bvjuv4c60bjfe4/24193763002.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/dawavabezofasorukime.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af4132a3a9e---31495306078.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c9737a305734aabce9a7a70a689ae70a/xupaxopu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083be43a6d46---zezetolezagevibemitux.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ktqk89v76vns2vcf3l8434r5q0/dakudenikuvoxutupibikul.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/90v6ij6u6kd8f37eelv6smrq36/73438998107.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/mejarilirudowekipug.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/wuwozoge.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/89a2f555e019a3ac31a0684df8ad6cee/dabikuludigikadefuraxe.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607460f6a117a---64382177623.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31bf14daa7---netoxuparuwi.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/63602209141.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/60991183894.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ecb64cc0e---junix.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c1qeh6no15v8u3pjv6kmpv4hv5/51422212685.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/jevaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=an+introduction+to+functional+grammar+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C26 16840 bytes
SHA-256: 5d93301e2d7dbf833e166d9ae5cf1a52983f280c379e39cb717c6d69e7727ce5
font_01_sfnt_off0001683b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1683B 10744 bytes
SHA-256: 3018e721015f1c25884023b1ad15f6170c672ba31e156b9af46fc853e8779336
font_02_sfnt_off000180be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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