Malicious PDF — malware analysis report

Static analysis result for SHA-256 578fa7c596602795…

MALICIOUS

PDF

89.3 KB Created: 2021-09-11 12:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1e015b337e6ae2eb83bf9b73487b7266 SHA-1: ad26e2d1e29f9d6a8d6e3d12ed1594d56c98ebb0 SHA-256: 578fa7c596602795476441b2df56882fadbba10a53df04313a2405f27e725b6c
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing campaign, utilizing a link farm hosted on compromised WordPress sites to direct users to malicious content. The presence of numerous external URIs and the ML classifier's high confidence score indicate a malicious intent. The file's structure and the nature of the URLs suggest it is designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613685a29d5be---78503081217.pdf In PDF document text
    • https://aordonez.com/images/contenidos/files/66869942707.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/54042737792.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/kopivarav.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/vevoleg.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/80771bdd83ed99a444d90fff314297c0/32721877006.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f26c336a2e---70734585851.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/barewafiroguz.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/zenigolimamosajuwugojasun.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/tomudufujonavugiges.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd000eaa69---87661711378.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/zezijuzeziraxas.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/91678429022.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/fibunijabefivem.pdfIn PDF document text
    • http://e-menu.hu/editor_up/ligipavaxogigujesaz.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2a86b0212---84179358157.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb40cbf23---15745240231.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33465628898.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/moruvarijidolunolosidu.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/57523386258.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/11772524214.pdfIn PDF document text
    • https://beautifulhairstore.com/upload/files/senibojilagulalevo.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/85007014950.pdfIn PDF document text
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/vineminuruga.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f80ff1b92190a24778ec5a7d93a9c55d/xunegevemevufutegije.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/89106567347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=site+that+can+watch+moviesPDF 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_off0000fa57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA57 10576 bytes
SHA-256: 80d571575d1c59f00741099ef7a5829ddf4e6c423803d0c9b5453e38a9024d0a
font_01_sfnt_off0001125c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 17724 bytes
SHA-256: d83bf051179c50508a184213b11861bb251e799f961a3704472e58a0e2fc2639
font_02_sfnt_off00013fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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