Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e84c13ec76d4054…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 00:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d061493207fa8efae9abf7a580bc7adc SHA-1: a8d2722981406669213334cc78accb0c1290c37a SHA-256: 4e84c13ec76d4054d0bb4e52cab38a407bf989cbe1116f0c6f967a7b59272a44
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is largely unreadable binary data, but the presence of numerous external links suggests an attempt to redirect the user to malicious or phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://etonbio.com/newsLetters/images/file/falitipatijaz.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8be8a1cc---jufewonawowiluzenugilez.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/giwajatubuwarudazewuve.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/26222260190.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136105e8d2b4---73088318226.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c65f80fd55426e027341c54836f0bd14/62979962993.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/dirizexolorigukudenam.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/37799257288.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210910_23FC5405798D3F95.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72354722027.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/kuwalerozijowik.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161458c9b74174---64771272962.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d483cd21b---lerozo.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/lijoxomafufu.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/31224486550.pdfIn PDF document text
    • http://klinok-saintp.ru/files/sifuvefixutiwizufoxu.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/18285338302.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/37291156844.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/bepakusawexefixubokab.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/35189634681.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/numenajiranugavof.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/75564245972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=facetime+with+alexaPDF 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_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 10168 bytes
SHA-256: 42b0bfb8456f2c47d05eb31561ebdc4810e86ecf184ccc893409fa849c553b23
font_01_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 17576 bytes
SHA-256: 7d09cf616ab9caec6be58ede1d021a160112005ff8f8ad12b47e482614465ece

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