Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3a2b770ebeb8d2…

MALICIOUS

PDF

122.6 KB Created: 2021-06-20 07:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d4ddd9ea07dea1ab283be5be3689f7d7 SHA-1: b546ae9f14be823c66b5a2ce49656eebab1ac193 SHA-256: 9b3a2b770ebeb8d2c2088d4b9beb6d1281bb25286776ea7ffc9e8e01a4b97cc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm pointing to various compromised WordPress sites, suggesting it's used for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of numerous external links and the 'link farm' heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/7a93e801fcef818e1cc1265a7ab0a0ee/26727597631.pdf In PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075d02058c05---bujojewafudawevitakewux.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/50119149141.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e46b595e7---jetejavizatarelo.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/45080256648.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a899788ef96---simoguva.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7fdf04f19---mijemepedabon.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/23cf4325fa7d99f6c074705cd1832200/5894043665.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3f8ee94ef---62619958695.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/parejuzol.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210617095040.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a44a189ab39---51429916925.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/88e619eb1600993cf8d8e39088109c29/58089327768.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/pexanobo.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/e7b1a890d361c37aa8ef94eb51ee394c/kemasafuxuvi.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/sufabapureledina.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/627cd68b0c6003f8ba3f9b17595b0dc8/91902123648.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d85d0dee52---4529500851.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=hacks+para+call+of+duty+warzone+ps4PDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E61 3676 bytes
SHA-256: 1f9e1733488dba98c2980c5a2c3d428a34b706c1e15f046413f575a0d6e45669
font_01_sfnt_off00016b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B9E 5504 bytes
SHA-256: fd552a3f687559167044216559893ecd214d79da70aa6ab5ed2caf7606edf717
font_02_sfnt_off00017e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E8C 17392 bytes
SHA-256: 6122293c53f588d9f70f5d04f7b76b1fa3fb537515647b4fe0e3aa76ed751991
font_03_sfnt_off0001b400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B400 16432 bytes
SHA-256: f4730a33f604d3d6db8040f5602cef3396a491f92a861bce1a9f08a94b778d4c
font_04_sfnt_off0001ca38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA38 6180 bytes
SHA-256: 8dd1acb237ee9b511375f177b309544bcb0229ddafb6f0c206fd893b4cf3ba6c

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