Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41b8c57b4459fa3…

MALICIOUS

PDF

86.2 KB Created: 2021-09-07 22:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 69df7e3c756b9599789160876ed916bc SHA-1: 4c34856707852131da85829be59cdf647137d4d3 SHA-256: f41b8c57b4459fa3513e13a71732f48f7a7b5d36642d2edefd53b90580779b9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b788cd694aa---15923936589.pdf In PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/ziwot.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/nopagasuzitafizutiwunidak.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/71747682474.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/fagutix.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160755ae53d44a---3487118235.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/gigibazenime.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/setetijotezotibusuvevazu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3503ca1af0f853fb18aa844ad2d4b6d2/wupuvobugekazebid.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/da958201df7a770fb19f9f4d13146695/74958409604.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021062910112567.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6fbe1f6e66cb55775a6e380b3462b56c/jokanasuwofekananovemanu.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/28195180357.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612c76e396fcc---ziraduginavine.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa05de1091c---debexo.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/22595d13d189e255061dedae61fe91fd/tedazurukifotutuzamunapi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/42f66beb2e3c45c8756e3fc86b986654/18782442701.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d54c95c1---85521942364.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/51853837957.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f589f5ad---nesosebizefek.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f75443426f0---kalekerinotomuj.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jug03m0ouhmjrms0l8muop5pf3/gelamobudedenumebewux.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/76265881404.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/rejed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=managerial+accounting+mcgraw+hill+16th+edition+pdfPDF 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_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 18692 bytes
SHA-256: e8996c5c2ef6db8da80ab6095ca7d8e90b49abfa32ebe68c23ba2ce307382882
font_01_sfnt_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 11300 bytes
SHA-256: 26ee4dc4991fdd18fdf04e49bc83f33de4f6b94413e6d3024c4233f56e96c0dd
font_02_sfnt_off00013249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1