Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1ebe1a3fbfe5d2…

MALICIOUS

PDF

95.7 KB Created: 2021-06-27 13:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 284915c41c4a5de421292a4635b23d8d SHA-1: fef8ce79befd90f724844c50b70dd6acbe6fba2c SHA-256: 1c1ebe1a3fbfe5d2be830124866e6db80d46f0e7dae020cdaea4c04273bb02a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document functions as a link farm, containing numerous external URLs that point to other PDF files hosted on compromised websites or disposable domains. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://travelstore.tn/userfiles/file/rotenakuwidaxu.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6ca8bdc2---pameta.pdf
    • http://keyflounge.nl/userfiles/file/purebi.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2618ca47d128b5def0d9a3ca6163349c/49071025733.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/12ec6e0cd9ffa98e5211d3232660c204/28063439783.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/2968feb7120e9111bdc6ef205f920f23/sufomezal.pdf
    • https://anthonygillant.com/userfiles/file/36738185697.pdf
    • https://vvpta-irvine.org/userfiles/file/galipebedevagux.pdf
    • http://ahkjt.com/upfile/file/26130552311.pdf
    • http://angarakshaksecurity.com/userfiles/file/13684334009.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/loxumubabonenuketuj.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bca0dbbd3dd---dapazevumitu.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5907e02d6---33141119777.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3d6ab728e---lebuvuvimopazi.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/0ea1ac2e604b3f85c00bcd5d813d0fb0/67983937008.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e13fd7019---fewisubatusa.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7341664163---bipexogegamonoka.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0d16e3b36b620c10ce51115bbe5e1bdf/gugemimojil.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/a9072874516850a203f2df517397e738/34924997674.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160accff79f3d1---zoxan.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/97977dc2effda527860832539e608518/tonebofek.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795ffe14afb---goxub.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/52005cd29ca1abfe66278594389e00f8/62962358548.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=good+evening+to+you
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001125b.bin
b4ffce0d11ca95e6c1036dde2b4f8d82929158e8708f18e55642cf81c1702b9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125B 19060 bytes
font_01_sfnt_off0001424c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1424C 16792 bytes
font_02_sfnt_off00015a63.bin
839fa8e62ea2b40008130f1d11e84041bfbeedc975deddee493d8999c5a67a8c
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A63 10264 bytes