Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f07cedf09c4f839…

MALICIOUS

PDF

73.8 KB Created: 2021-09-05 16:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4621bcad7f37e03c87a6f8ff615b61bf SHA-1: 0a166badd67ea9b7da26ff1faebd485739628495 SHA-256: 4f07cedf09c4f8394dc494380e833d2ff9536eb50c3f17e287f43b6d73138688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on disposable domains. The presence of these links suggests an attempt to lure users to external sites, consistent with phishing or malware delivery. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=microprocessor+architecture+programming+and+applications+gaonkar+pdf PDF link annotation
    • https://termokingbt.com/ckfinder/userfiles/files/98569075630.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/jewajubisixagebam.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/22317186977.pdfIn PDF document text
    • http://fotomil.pl/ckfinder/userfiles/files/febagitob.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/96767055325.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/23150499556.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/56115181623.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/98216990909.pdfIn PDF document text
    • http://yukamifashion.com/upload/files/fofuwagijix.pdfIn PDF document text
    • http://trubaopt.ru/content/file/woludiniluzadofuni.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/8504728253.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/b82173acba11a15f76b4d22ddb0bb8bf/45363328699.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/4085167620.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f73080f3cfe72f7062ea7cebf8362ae1/bavesebipurapuzemoxapiwip.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/wunesevuxorebokadax.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cb7f62acb---57668772847.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160accddb9d256---bakemevinonul.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c0e08c1f3---37929246527.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e40aa0a53---munudewuwize.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/zemijurinawodakudijulaw.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133eea35ab7d---81674692801.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/54899690738.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1be8a1443---45620587258.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/lilarixoxiwaraxub.pdfIn PDF document text
    • 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_off0000bb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8B 11252 bytes
SHA-256: 7c201c3fcf6eaa192ebc09e6264d0150128b54299b7d6d8a5ea0528dad8954b5
font_01_sfnt_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 16864 bytes
SHA-256: 38596b99c23fb45d52293f773854d7ae96c6b9dfc189a6bdf981935a73405ed0
font_02_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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