Malicious PDF — malware analysis report

Static analysis result for SHA-256 256797955672fb14…

MALICIOUS

PDF

83.9 KB Created: 2021-08-15 14:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2492b9c871977e64b1d9a9cf46cf9d09 SHA-1: 1f8f43390b7c9fd6c6b28af1fa583cbbfd7a75cc SHA-256: 256797955672fb147332d846e8d7f174656b5d5745d723f05e8f36ded866ac0b
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 0.9977

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.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829c2cd737e---suzizaloxuba.pdf In PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/3o37glg6j3jj6drg821qta2q50/wanobaxomatoxedavapol.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/27d0cd6e8be128469a3b4a3820499d94/99791441222.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/tutumagenumuvip.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/kikumifofezanexerimuvi.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/34498126794.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/c21f6a66df55410ad8a74bb4c67d6d48/1460206526.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/30165736434.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/6084454783.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/3f9ebd4525f00a46e8150d175ad7f148/89905734671.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/retufifilasejisevijuli.pdfIn PDF document text
    • http://dzbnf.com/upload/file///49954901602.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/19192967610.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nasowakovokelebixof.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/sekipojute.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/136187089060e05c675092f.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/dabf1da3ef80c7ab61864383a7b0456b/91986068009.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/lgs87unn8ullsgnin0j91o4oce/liwilizirifekuzaxopa.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/26022303587.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/dopimegafode.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097366edbe9d---xefimepoziwigutaza.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb37f99c2f4---86436756495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=catia+v5+training+book+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/66265561967.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A2 10788 bytes
SHA-256: 4bb6234b19cad802a8878da9c2469fdcf69c0a45cbe0452d331f9b9e0e0efb98
font_01_sfnt_off0000fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 17420 bytes
SHA-256: ed88673c7082a544f27829a300d213d57d62e6f4ae1a4b6e272f001b4e15ecf4
font_02_sfnt_off000129f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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