Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f7c159a96586d7…

MALICIOUS

PDF

94.3 KB Created: 2021-08-04 02:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ededae48ee9cca591af1a2f6ddc73d1 SHA-1: 79c1ebffd13fe0e5ad925f0b9e814b1a14fdbc27 SHA-256: 74f7c159a96586d7b10dd2ae52fefd638fabfb9910cc67ea14d6583cdf50c6a6
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate the document functions as a link farm, directing users to multiple URLs hosted on potentially compromised CMS uploads and disposable hosting. These links likely serve as a lure to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lawfirm.vn/MINH/user_files/file/76762779705.pdf In PDF document text
    • https://keluargamimpi.com/contents//files/38066127601.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69d222d0e---10267578455.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/b6b50341ee3c4a02d40afe8332715033/fikofim.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/feratogoduvafasivelamew.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/96617d46de4bc694ae4e42205454c08f/95487771828.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a74da2b9166---wimajumagatu.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/81735622440.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa1177252---75037273440.pdfIn PDF document text
    • https://castel.ro/userfiles/file/60777946371.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c87a8ac58e---jifutuzuregokifilolof.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/251d78d6fd47ebb112de14b81c261704/86472794481.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/91509eb651f8833ea20ec85a788d4c71/55291954936.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106131506317754.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/0s40u38gsk9rhl0vv28a1ouhqu/xaliduvadejeluko.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/soziregurebozez.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/sekisunalevopilumika.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b87638cc21---98826609387.pdfIn PDF document text
    • https://kar360.com/resimler/files/jojokivi.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cbfb1dca0---62979793056.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/qkj9g532j67s19cbn4levkagml/simimumatibot.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/c78924f1eb31bff4c0a517d215cf6eb3/tutebujokure.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b36215e6e---fopodopenidipudo.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051606242435.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f51169e20a8---12441572311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=final+destination+2+full+movie+in+hindi+free+download+worldfree4uPDF 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_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 17004 bytes
SHA-256: 28f4d01082a47b16281bef9987acc4bbaac14632f14aa257f0913d87fde0ada2
font_01_sfnt_off000137fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FB 11044 bytes
SHA-256: a70b96161c3d28829a46be06be91c1b40e9713ad83390ae4798640cb5bb7ec53
font_02_sfnt_off00015198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1