Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8b30b8189c43b8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-01 12:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 399d7fd5fa9bb059f0ef148a56966a40 SHA-1: 9f482fed67733c975bb693e79a553cf3aaaaa527 SHA-256: ed8b30b8189c43b88c48a699b4078e8200dd80e03dc8f627b2a1ab4600caad51
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is unreadable, but the heuristic firings clearly describe a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://thebillionbottom.com/business_school/uploads/file/voxisadulerubuz.pdf In PDF document text
    • https://rajaketiga.com/contents//files/41757682185.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/talepejukapekawuvagimi.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/76kmm1e2r61dh4gkva2e6ll98h/laledejod.pdfIn PDF document text
    • https://migger.dk/userimages/file/73228861053.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/suvapuwam.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5d30043ed---84120173746.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/93420982648.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/37691418015.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f9087a528---36637384226.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/nawekurubagezisubifuv.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ed13a19e4---3474905941.pdfIn PDF document text
    • http://congluc.com/upload/files/84533150116.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/76363203728.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/gulopikuvis.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/92579984573.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/pegegofigekoliko.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d338ef2017---25294019273.pdfIn PDF document text
    • http://bowenworktimmins.com/clients/e/ed/ed750a77e36579213b976c45729ba45c/File/vokebi.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6d4e3b1332f694b4680c4da3393b4976/dudeveba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=28+meaning+biblePDF 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_off0000b95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB95C 17312 bytes
SHA-256: ed370c777c0d2b6a207c6192f356c21bc2cac973f15ad82c98dedb985aba6045
font_01_sfnt_off0000e5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EC 10336 bytes
SHA-256: cdec0d62e261b1cd77eed8a830e06e1eacbba7ac4114744e794a8d5936a19f24
font_02_sfnt_off0000fd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1