Malicious PDF — malware analysis report

Static analysis result for SHA-256 da487dbbfb62cf4b…

MALICIOUS

PDF

107.3 KB Created: 2021-07-03 08:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c28240765cddd408995496431965d1fc SHA-1: ab54a976edb61576f55092ec84e6ab28e5f036b1 SHA-256: da487dbbfb62cf4b2876aadf5444fe0cd5a92f9f6ecee56474541ae0a51475cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

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://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0q5mm6g9fjo0gm4sej3cai0751/tebirudubuvijulibuta.pdf In PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/56503193457.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2edb3a8b1---14340155646.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/90ffd5b162034eaeac08cdeb7f1ed425/guzavobatudulutoruba.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b9a388e9d---13155208778.pdfIn PDF document text
    • http://arablift.net/userfiles/file/74414091363.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/notijetutemufokumatowerub.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abdf9c1a9e9---mufuzefuk.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085643d7f747---64546400147.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/tuwusowamodopajomu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede47ee1e8---34637245920.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/tomimubim.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/dunuwipulol.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c98fda8c515---52820545681.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/midalagevanujozaf.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/fijomebulomajulumasaxip.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/smr8ms0kiop9oij0i22qhtbvds/1808152342.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/i7k2dvnphr1m8t9f4glj2g7gca/36087647472.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/lemoxavorop.pdfIn PDF document text
    • http://sciattella.net/images/file/28464721177.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/lanefibumipedirugegesabus.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/415a2c9f6417b4cf1b7dfc918b98a595/96349676645.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/qk7gjlmr8907f2rgjjjp5jur6m/92161497266.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a2909521---seputatabodibiguveref.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608425213e391---95762321480.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c539a5a7b---38352565941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gall+bladder+meaning+in+tamilPDF 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_off000142d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AE2 16968 bytes
SHA-256: 632922464e50dfff81c5cafbbaf7f428449a20398701c31c1c52e18112c17150
font_02_sfnt_off00018645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18645 10484 bytes
SHA-256: ea6efe2e4f7fafa12d77e0a2768d97e0baf34e969a9e864ed14fef07dccae6d7

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