Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec8f37107a2190b…

MALICIOUS

PDF

171.1 KB Created: 2021-07-07 02:30:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d7034e3cde67a65423f7ef3cc8cd4b30 SHA-1: 8c3659ad055e9f024c311ba5bd983e0618a19f53 SHA-256: 2ec8f37107a2190bbb4a419f671622c084494ebcd3608a7d18ea83ca729857ca
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external PDF files hosted on websites that appear to be compromised or used for hosting malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9714

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://fitviewer.de/files/file/81113788089.pdf In PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/jasefakoloza.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d8406b0d---tezage.pdfIn PDF document text
    • http://intergeored.com/upload/File/bupamozelerutivovi.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e0a3af8b3---munokokanozegevedimoz.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096893564b18---47687587259.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/b01e8093d19d3fd689dfe46337e8d33c/64765819916.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/sojumeri.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc00645e78---76710319508.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/982e3e2a3c703900244ada1bdc019887/1592702814.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160788cd849080---dejowinetesakaweluxanuket.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160acd8e2f3b5a---jotesewurijixigobazuxifif.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a43277d29a2---turipifipebakoxemavixaru.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e39eff53c9b3f26ebbe4369a56cab4dd/dafevategasaxadebatepu.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/cf6be9c3396ab1b00030ed4f1b54f95d/83878932502.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/1bvqe1pe0ihfj1bbj1a2gafgid/71757496891.pdfIn PDF document text
    • https://nada70.org/userfiles/file/73959456727.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacc3d47e77---vipusitujufalijufuvunute.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/44108607233.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/jujiwejajirop.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/93235981818.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a0a75143f---jafaludakepalujusoxumamam.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/lupugasoriwov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=biblical+meaning+23PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002210a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2210A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23921 10572 bytes
SHA-256: c946e4a2473f8d56ed98049c74185005798598973febe84300ca2d45d9e5ff30
font_02_sfnt_off00025146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25146 18124 bytes
SHA-256: 67d77c7407ef4226c1da87aa71a4331d017f7e00e037d7dae6e61f5ffb01f5ca
font_03_sfnt_off00027fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27FBD 18720 bytes
SHA-256: 90d50f26f973d68ffc867a66fa6890dda57443404aad68daf77d410b3f68e8de

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