Malicious PDF — malware analysis report

Static analysis result for SHA-256 25dfc5432e26e85a…

MALICIOUS

PDF

127.5 KB Created: 2021-07-24 05:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0e79110544bd69d5a5f68bc9d1d98f1 SHA-1: 44a20fcbd9355e337d2dacb98b090d946212adec SHA-256: 25dfc5432e26e85a8ef959e85db54d8ef83848d8ab86715957f04d3d71502272
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious sites, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://suachuaspa.com/upload/images-content/files/gegamokilijamowiko.pdf In PDF document text
    • http://arcomproltd.com/userfiles/file/89721341574.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ccb0a0854---xugijumo.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/7395162288.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/0fv1jirosq1clo3sdh51td1tnk/tesasozut.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/95986849629.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c32b090a1---85046459159.pdfIn PDF document text
    • https://businesslife.com/content/file/xiwuvovupojiwasu.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/xukuzajulejififusinozo.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/31250662027.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab387654a60---96780947279.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/vusepiniwin.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/292312594484.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7c6b14c1184781a4f1323ed915350c3e/mubekuvobebejag.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/neviximazowiborizet.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ac2c82419---dulesapoto.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/fitiwalepebubebetoxuze.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/064f96fa42f65f46a8dd53528b85af3e/gifofezanasafezuz.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d769dd9d198---482572605.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/23147860620.pdfIn PDF document text
    • http://promador.pl/userfiles/file/53724401966.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/057091e0c7ebaad38a6204fe6d472e8f/pasenuvir.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/90601038827.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/jelof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=family+feud+fast+money+questions+and+answersPDF 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_off00018dff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DFF 10936 bytes
SHA-256: 6d9e255d4383d90d926840afe990bb76ebd70f87c1411bf6a88573907909d3ad
font_01_sfnt_off0001a729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A729 18392 bytes
SHA-256: 3e5e5f734ad61d8a4571d91898158ddd88c9bcac73cacb70e77499da45e5c0c6
font_02_sfnt_off0001d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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