Malicious PDF — malware analysis report

Static analysis result for SHA-256 6425b12c4913152d…

MALICIOUS

PDF

93.5 KB Created: 2021-06-29 12:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6678e2e23f19c9541df114b6f2474af7 SHA-1: 5a863198479731468a8ff287072d7daf0fe2bdde SHA-256: 6425b12c4913152db95d51ac2857f37974064ed9ca39371b97a861e9ccb131d3
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple compromised domains and the nature of the links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/58c3bc90267568f12abff3e8f430f9ed/jobovugojam.pdf In PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/8nmrdc0c5jh5elulaa8ajvg10m/52058782518.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082da31c8559---27829499597.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b1c1e1b2---votiruzepogitasuxo.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/41176660280.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c217808348---56670187472.pdfIn PDF document text
    • https://loctra.net/userfiles/file/37848799874.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/3226b0eb278db8d4b23bacb52baf2404/78616019418.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754fc700722---18611357134.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///61660794214.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/f6orun8rvglerc0vj7t6osjoqo/4164500818.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef57c830f3---mibetetitirimunimopulirir.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/dafosaniv.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/676cc243954215834b37d4067081313f/33341552954.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/05204f4605665e0b2f34093278fd5dbe/vevosonororulijajokij.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/josabaxat.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/b98a0a9fb311dd054cb2bc53dad9f8f4/86820080987.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/kogeges.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/9a7b11b334c3b7561ace1dc3b143a47f/42764121687.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/5f27a160dd3acd3848cd3f04e1f7a920/7900140276.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/9357756572.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/2734e4e8a7354b09063a617ed65b62f1/68722919926.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/d632e02bceb961502dc149940db63732/73934683199.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/feebc728d33c106ca8b122fd609a07bd/24234185376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=day+8+tonsillectomy+recoveryPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 17544 bytes
SHA-256: aaa246ced6fe44bea3d2c2b0eb069e7bb03d82520cdd6bfa3ae3a0b0ef7dde28
font_02_sfnt_off000137df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DF 16340 bytes
SHA-256: 88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15
font_03_sfnt_off00014dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DD7 10780 bytes
SHA-256: 1afffdd92f81b3f3b2aee138798112c8d5b286894682d268932809164d6db96d