Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd80fdd59114e69a…

MALICIOUS

PDF

88.3 KB Created: 2021-10-12 10:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0f07a848e44a377e9e6b9064ec4a4ceb SHA-1: e18a2db59730855063809f94a633339d67ab740c SHA-256: fd80fdd59114e69adb1d3aada98cd5eeeb86b410deaea8a3c208d1731f4fa316
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs forming a link farm, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent, likely to lure users to external sites for phishing or malware delivery. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=pic+collage+iphone PDF link annotation
    • http://kisito.com/userfiles/file/15091965892.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/bexulaxoxopiduwupe.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/kuxetimojisereberu.pdfIn PDF document text
    • http://meta-min.com/files/97654416366.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16135c1d920026---luneginaselev.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/98046766097.pdfIn PDF document text
    • http://modern-pro.ru/files/file/2051202634.pdfIn PDF document text
    • http://kolesa.sk/files/xijekapiwerageripisaj.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/17582214574.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/98826838595.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/kubafazeron.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/22988857275.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/71e31e853f26925976ff9e9cfaa01c6e/3993571853.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/6989992261.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328cb529d58---kodonapifisir.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210929114845.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/woxonewuzevipabefunito.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3c7be6e6---tufigakebubisezenafub.pdfIn PDF document text
    • https://iohrp.org/f_files/files/88093422552.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613569b28bab6---97083376695.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/92635748773.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/mavaxitamunanurel.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/gekebokapem.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/34279455903.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/rupamogolofew.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/zikarejanixexan.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/tunularitawefujosi.pdfIn PDF document text
    • 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_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 10288 bytes
SHA-256: b0a87fd70ff22f5a3d2b27088ca31a50919e696e6a73cfbe39c73ce01522c782
font_02_sfnt_off00011ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE3 20084 bytes
SHA-256: 51fc2a3be1edd916d97eab6ac6321b844f0e6095f19cec7a5dc62c473ac6d98a