Malicious PDF — malware analysis report

Static analysis result for SHA-256 49634bee603e8490…

MALICIOUS

PDF

99.0 KB Created: 2021-08-05 22:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a95a9ece39e06692fca33b58a73800e6 SHA-1: 759a2c549935cb05867b4812cffe49ea8d23f70d SHA-256: 49634bee603e84909e1c9f66dcf5634e521daad3b5e9d8277031d2ec819ec761
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or phishing pages. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=how+do+i+apply+for+a+woolworths+rewards+card PDF link annotation
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d58c77844---kutesegowisiguwoturex.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160819e12487d0---29701813473.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/c64jalbchjg185btqr3n8aa02t/9504395916.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/5c16c79b48dd45023b0eb01396cfe2ea/mawisugumikuwopubumebob.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/74dd94f0dd19110ee1cc69a76546ef8d/48385977563.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16092824430232---87840109355.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e120aa2be97---fefapetusi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd1299b7b3---60979889750.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/fijofezejiwazekag.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077306595f21---16447022222.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609037549a54f---95824846909.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/tovitebedamojarutemu.pdfIn PDF document text
    • http://juha.be/_files/file/pevejavomoraxenu.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/kidelewebegenitidon.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ikkagcbtf0a4k3qggm0msouto1/37558847049.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858307674cd---dinuwe.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/73292285456.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vuvexure.pdfIn PDF document text
    • http://matras-devison.com/upload/file/49550794316.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/devib.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/sopixisufovize.pdfIn PDF document text
    • https://keongracun.org/contents//files/72664842683.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080e430a56d0---4241813431.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10641 16232 bytes
SHA-256: bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d
font_01_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 10804 bytes
SHA-256: e3d900b90e5aea6b6e309598a5fcba4546d080485105e61611864aaace0a8758
font_02_sfnt_off00013534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13534 18000 bytes
SHA-256: a21dd89dd44ad2e1470db9c34d6ffdc0f028a56f02268865bbe6bb3a3b86893b
font_03_sfnt_off000164e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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