Malicious PDF — malware analysis report

Static analysis result for SHA-256 1958e5648e4c19ad…

MALICIOUS

PDF

210.1 KB Created: 2021-09-03 21:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43057a74abf703b3eaeaeb789ced9d59 SHA-1: 0cf3117716a1749a6b54051082dbafa915f58aae SHA-256: 1958e5648e4c19adb106492b7b38917465d32e77f6e3708e28ed16e206c08326
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the PDF containing links to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of numerous embedded URLs, many pointing to compromised CMS uploads, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9671

Heuristics 5

  • 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.
  • 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://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa11a87d0d5---dejeweregubipejafuzi.pdf In PDF document text
    • https://machnhaduong.com/images/uploads/files/buzukukuwilewibo.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/25001968453.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f7bfdc50c62c4917b0b6aac6fb0a8ad3/goveju.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/c5319a7db7a31960d22b669874b1e7b4/13586184625.pdfIn PDF document text
    • https://nevisnews.com/userfiles/davalopomikikolivupi.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/54181996978.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160effacbe5abe---12730499619.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/9f528764feb0fc521832db7d81fa9a90.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/18318405834.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/a4efdfecb49fb686ae8f14c6794c67ca/mabiteve.pdfIn PDF document text
    • http://koutingchina.com/upload/files/nefolir.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/betemotafezuruv.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/39f4cb82681044f2d376aca483b980dc/23185701591.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdf52c8155---bagamatokevaxijufexuro.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a36f2b98360a0b01e1b5d847cd83a68b/3881068605.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/be63d7d119af3e06a6ba8629d2a70046/65557774024.pdfIn PDF document text
    • http://heorungminhphat.com/luutru/files/kawaruxisewivoja.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/velevorozixenanazu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160d51de77257f---zuwero.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/sibsblsqo7ldshmqf05rbfsp04/77323028255.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086c46c116cb---funas.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076653d4eb74---fisogakuninawana.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/suwizotoverode.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/63428325039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bill+nye+bones+and+muscles+video+worksheet+pdf+answer+keyPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002d1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D1F2 19664 bytes
SHA-256: a2adc1b5f6a239018c9e23d6af54cd4b0dad375b086539128f761e7cefdb6a8c
font_01_sfnt_off0003055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3055E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00031d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D75 11536 bytes
SHA-256: ed6d42e849a45e372ac25086b10af8637ef7ec506be1e1d4b4f915585efc5d6e