Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d2aca8a8032dfd…

MALICIOUS

PDF

95.7 KB Created: 2021-08-11 00:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 2cc9d8399b1bdb51e715a2603f00db1a SHA-1: ce55206cbed94d9eed1d31d0bb077e4088981a8c SHA-256: f4d2aca8a8032dfd9b2151ce297e3258eabdb9850349664212e0696bcbe691bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or malware distribution campaign. The presence of embedded URLs and the heuristic for a 'download button' lure indicate an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e0b90bdf4---logexizuj.pdf In PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e93a80fe79---17496296393.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/51783687082.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822bf9de32c---26382378923.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/lupuxiravadimab.pdfIn PDF document text
    • https://istanajp.com/contents//files/93407177337.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/85318706667.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/c0e00e9135d16183580a4f9cf2fe7aec/gajujukasitikuma.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/biliziroz.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/wixuk.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/38066592311.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/pafisaduruzegepinapuk.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/71ec6432a430c097bd9381123096ae6c/22251533512.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/g8gifkssvajhc6t9u6r55nptan/49797617100.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/49887940954.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/a6046ba7nfau7ea5drhnmhes6h/numidezigovabazafem.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/faxegobisi.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3e00ce2e0---melotisoxojoruli.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/nonenipovimo.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/21464088524.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dda7cbc226---furepogaferebaveg.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/c5a9qk9du5dq9bgmla9t83gk94/wenototijefewason.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/c52ff1d374f2ab8df2cda1424457c346/578722777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=download+chemistry+textbook+pdf+class+12PDF 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_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 17132 bytes
SHA-256: dce836b91bc0df3f3c6f82942d5505298ea94787cd757fecabe56053dcacbedb
font_01_sfnt_off00013d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15536 11592 bytes
SHA-256: b0bffe3823a78410e39dd45fd62fe58c32ae3f4703aed14e32b46e1b492d203c