Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c92b46f7a667c3…

MALICIOUS

PDF

86.4 KB Created: 2021-06-30 02:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3a268cfb70e1ebf6d82fba4b9905e2b SHA-1: e669d6789edeb052c69ef371b7cad0825461f3e0 SHA-256: d7c92b46f7a667c38bae93f09ac82b92c664c71fd08a8e5ebce4cafa235e91b6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://yournew.site/wp-content/plugins/super-forms/uploads/php/files/63e8h1ja9kdqrv9bcesjbt0jks/51008347542.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91b6703e2b---jadunabukiruvaj.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/1bb0c0613f6a2cb22beeb27c6a169cfa/vopozibatixamole.pdf
    • https://colakcivi.com/userfiles/file/65493384249.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/liobn4nbqsdlsuo9cpvi4h7736/pumufu.pdf
    • http://piazzademarini3ge.com/userfiles/files/safuwexiku.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16075b44555141---49875342345.pdf
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/wameto.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/42a7308a2a4db4e77c8ced53d54b00a9/wosaxabasi.pdf
    • http://bafiti.com/sklep/userfiles/file/zabimiru.pdf
    • https://premium-house.uz/images/file/jujobej.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/eaa08a2630d021462a0d6a3b901ecada/55468282204.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867b61a888f---26014499730.pdf
    • http://yjsyrj.com/userfiles/file/99594947789.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/05b13883d090708f5cb6bfd2b5e9809c/jifotevamarixise.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/997337988b8332a8498aeedba2097465/90830259268.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea3203270---44439227861.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160996c4b29844---gasojujekomesuzir.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16083b979df6c9---josasenotuwijerule.pdf
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/2723958463.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf902ad7639---98233860145.pdf
    • http://kayamedbursa.com/userfiles/file/11077761065.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608148e48bd29---gagigugatilibotat.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/160926058.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=canon+g12+instruction+manual
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da54.bin
c640437ecf7801912298a10aed917a200757c514884974819edb6bc0c3a61332		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 21336 bytes
font_01_sfnt_off00010f50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 16792 bytes
font_02_sfnt_off00012767.bin
b14f2959caebf68b1acb96bcfd078aa2e0f53a5285330ffbc377d273fc690dc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12767 10744 bytes
font_03_sfnt_off00014039.bin
acb4b4b25e50f7685ecd78cd215bef76039b8c36bf651eaf5c5b48906fb6dad2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14039 2268 bytes

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