Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e387606b284b34d…

MALICIOUS

PDF

88.2 KB Created: 2021-06-28 05:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2266b249964917827474ca61ab7318de SHA-1: f66dcf0c7d3a63f4eb39093fbbfb787d91bca7bc SHA-256: 4e387606b284b34d7317e6b0fa64c2f30388fe0bcff6a1ffe6b7b49250168ded
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to distribute malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be part of a multi-stage attack, potentially instructing the user to decrypt a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://ajk-opakowania.eu/upload/fck/file/rozipazixokafofesox.pdf In PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/7d2adfdbe505214c643fa9aed8a24f2b/15614489417.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/4365ffc7a97b50cc216114eba322bd36/38979270823.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/37610911763.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a991cd7716fee07575b0b4d2b13ea04f/zexupibiwawivisirakadi.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/jolowuwaliwigobonunana.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e0d236fb5e662cd87f4dce941a0a5b2d/77377731500.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/5ikfl0vbmni2ofsf74cdqcm001/51489959955.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/660cfd20a0a04ba8b8bb00ef4c02649d/68657196838.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfed6425e---99254153384.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be2ca10a89d---dizafolulidonev.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/66621003567.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4da00c1a---87264214899.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d7b59d10b---78928249237.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/nusexovorewa.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4324611b37---rasasoripepikokitezu.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609fea51645e2---50418239404.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/kpslsn3212g5uhoi9hfs65vm7v/88025205468.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/e85a9d625f8937b199866cdbeb7d284f/xazuziv.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/fjobeu89jkrs7bg0t6ed0m36iu/ziruxegarejusosibodutaf.pdfIn PDF document text
    • http://dongkoo.com/uploads/editor/files/90532821733.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb741d77e7---32896236725.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/8917268167.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fd7b0d3ea---86966543101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=gta+v+ppsspp+for+androidPDF 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_off0000e518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE518 10420 bytes
SHA-256: 24b4344dad241bcc194f7bddb5da221e79f0fb6ba5091637fd96b5e86fdb5fac
font_01_sfnt_off0000fcdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDC 24088 bytes
SHA-256: 45f39a2322ecc9a12dfa0027a9f3fe97f4ec38e3402e11686c5c06ee26f4bdfa
font_02_sfnt_off00013975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.