Malicious PDF — malware analysis report

Static analysis result for SHA-256 58220fe59d3bfef9…

MALICIOUS

PDF

85.6 KB Created: 2021-07-22 18:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4035a73d085de66735b2cb05a44dc91c SHA-1: 7c0ec180fdc61b1a2f88a826b5c17d4922bde4cc SHA-256: 58220fe59d3bfef950e9f3a52079649129f19a64ea374856f419ef4ff3dee4a1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits malicious characteristics, including the presence of algorithmically generated URLs and links to compromised CMS upload storage, strongly suggesting it's part of a phishing campaign. The heuristic firings and ClamAV detection indicate the file is designed to deliver a malicious payload, likely through one of the embedded links. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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
  • 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://koryosushi.com/uploads/files/74577226923.pdf In PDF document text
    • http://www.anclupnapoli.it/userfiles/file/fizalukovetarog.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/f0an2vakn3m97hm5lggj41t723/xixeka.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/38588252436.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210505063046.pdfIn PDF document text
    • https://esvigo.com/upload/files/vuzozesamolipevuruvu.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/6e2a3dcae6124af4f0ddf07bebec8d7e/sejifidiboso.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/8cb00674d162d4e8f949dd09ecef15eb/5626078634.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084f8e2d768c---tilunagobusax.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf1b1debe---saduwifu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lugakutikoxonutugazized.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/dozijomeduwufomaguravosi.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa72d975d7---15985566288.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/37599604736.pdfIn PDF document text
    • https://airshow-bg.com/file/93935565581.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/binibemaf.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/jokovawe.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/42f58ea2809c452c217ae7583437df8a/20714103220.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/6e5d7618619b3676e1bcc4557e940bfe/pitefusikagabezepajujev.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/hpej2glu06fnj6n3afut241nq6/ziganuxesipawukaros.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/36724001370.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79e0be61c---16437258320.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b6878e9652b---zuvitulupadapa.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16073d813328df---sijadobuzefubufifepemalub.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/kurowalisemokujozapupura.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=3+card+poker+hands+to+playPDF 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_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 10800 bytes
SHA-256: 3c3801af133906bdcf7fc738a696a53b9e6eb37c5ba43c5310463456cbf0331b
font_01_sfnt_off00010542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D54 16792 bytes
SHA-256: 2c219c9b28e69d56a69678c62dcf04760ca69c6480eacaa41cf7af3fe28b3077

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