Malicious PDF — malware analysis report

Static analysis result for SHA-256 7797c42d47e9286f…

MALICIOUS

PDF

95.9 KB Created: 2021-09-17 02:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d2648a1c2c56e49d472022b7b86881f SHA-1: 96a24f4b5e1c4312c83c8edc9be9330f2ecf578b SHA-256: 7797c42d47e9286f3ddb581f0a98f486f4ea7d8619e59fffb675e65ba3c4c045
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

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 http://bsl-trans.ru/admin/ckfinder/userfiles/files/zijubepasokatazasumemuwiw.pdf In PDF document text
    • http://nbnjl.com/userfiles/files/53547010872.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/59188967571.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/41354275472.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/84433072640.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/voropumit.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/kesadurabarixawebuger.pdfIn PDF document text
    • https://unosms.us/userfiles/file/42276522143.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210907090637.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140ceca5da05---bipigaj.pdfIn PDF document text
    • https://kaparatt.com/images/File/juxasiwija.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/fapuxifekoti.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/c30952e0835bb735919aed92f68f2d5a/ladumatupi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4d04e8445---96068561724.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/wolanuzeno.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/fc979c993b4d54fbfec3dd1597c211bc/mixinelajatisadulude.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/81498720155.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/degigapefab.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/82278449544.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/13820220065.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343490ca524---gapil.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e4igiroc2q5jsn4en1nvjbson5/serovawukorawimelep.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/zonubotabilarejanuz.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/fuxes.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/lujorotugunaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=tap+tap+shareit+downloadPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00015741.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15741 10540 bytes
SHA-256: d8ed5b5db08fc7056e674e3d0c2fc699eb37cb03b0818eccefcc48c85faf4d33
font_00_sfnt_off0000e189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE189 24736 bytes
SHA-256: 87aff757fda5995842dcfaf8610d7b20e040076addc7a8ea2df1cb7ff70a1a51
font_01_sfnt_off00012020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12020 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001402d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1402D 16488 bytes
SHA-256: 7f2253949599c0921345fdbf65a3c7d2a8f0a97cb0a881cdf36e9090db7a3906

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