Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7fedb3c8534b2fb…

MALICIOUS

PDF

88.2 KB Created: 2021-07-24 20:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5a941128fc93ce4e217ef42f75038655 SHA-1: d88d90007a56bb21ec5af5f6df417b58b9eb9970 SHA-256: d7fedb3c8534b2fbef020c3b0b725869bd52602d468c8d90fe88a60f34486f7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to potentially compromised or disposable hosting sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://taechoclub.com/FileData/ckfinder/files/20210601_0D575AF6C427A803.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bceef76075b---96078874578.pdfIn PDF document text
    • http://hnspkjx.com/d/files/jebifovejomeviwilu.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160808d1dec3b9---wigokexuvap.pdfIn PDF document text
    • http://www.manorbymajor.com/userfiles/files/lowuku.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/42348838792.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/048232c8156bbaad1a5323246f4b5bd4/41860000234.pdfIn PDF document text
    • https://laser123.com/geektic/files/lemaripilozerozudisob.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/badubumubadovewejevijute.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b07841b2---96828340513.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da779008b31---pololuriw.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/tipuf.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/51682438427.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfab12976a---gesutilinisoroso.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210628150232.pdfIn PDF document text
    • http://midlandhigh79.com/clients/866549/File/liguzo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecacdde2e8---2426894217.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/fibizivasiriwuvaliwi.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/97297477876.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/tirevogi.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/68275714508.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/fixogoveritaviri.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a97986d85---40540445330.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/xojuxumokojegubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=operaciones+con+funciones+division+ejercicios+resueltosPDF 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_off0000e986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE986 20484 bytes
SHA-256: 0ad3520c188b366965f1f0add12c3919809e9bf7a6fdf0076507bbeb631b2d1f
font_01_sfnt_off00011f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13748 10932 bytes
SHA-256: dfb2e7cbeeebc19aedb1bac53f368299efd0b5a89716b87d150af67ba03af0c0

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