Malicious PDF — malware analysis report

Static analysis result for SHA-256 71548a5d78ef5f94…

MALICIOUS

PDF

83.5 KB Created: 2021-07-03 03:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4155bb954f39ec479d24525cd7a2d60b SHA-1: 08bd66defe3c9f52aba057b70d8060cc3810e536 SHA-256: 71548a5d78ef5f9435515bcd50439c0309ea2fb33440485bab3b5d5745a27e04
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure, specifically related to invoices or payments. It contains numerous links to external PDF files hosted on various domains, many of which appear to be compromised or disposable. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a workflow designed to trick users into downloading further malicious content, likely through a compromised CMS upload or a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://magicdiscoradio.hu/userfiles/file/74438878568.pdf In PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/78705950703.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/47119977661.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/32943787190.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2c5b878be---zekiwabikotizedukev.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210606191801.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/18319541344.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/41452684372.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/28246601067.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a365ef420f9---dekirulategivifen.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad0638f88e---18499773782.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/93134927690.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b503ee3bc0---kevuxapevakurapagumop.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/3589775431.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/2fc02e30ef680e97bfb4c3d854f3e22c/wesop.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a09304018f0---5852120266.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/92535836261.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/62706236923.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/6d5b277696efc2db1514e4720e0a102b/labarevunutisubu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d02a86fb5---somofeborajalobivelu.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/vptcs0cepkbs2t0anvfs8mshsi/mulusuvodexogiku.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160799b9dd0ab3---99040636345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+deadliftPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75E 16784 bytes
SHA-256: 69c26c42b361f111961be407dd305968724a761358da57df3184bbb3c668ec92
font_01_sfnt_off000112a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A3 10052 bytes
SHA-256: 4fb59b102c85740231d08702490390aa38edbbed23c67430f0d7199cdef557dc
font_02_sfnt_off00012917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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