Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8ce8e413133313…

MALICIOUS

PDF

79.1 KB Created: 2021-09-22 14:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ff52b59a0b5a87cb6b4fec1b240c4a0 SHA-1: 6568685254c2aecc43aa3b12e65bdac70f9d5f2c SHA-256: ad8ce8e413133313785dc784b5c23ea4f2bd2cf1ce8ec8501be7adc90707a148
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://zippy-inc.com/app/webroot/userfiles/files/ziropajutosuruzajajiwuf.pdf In PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/lon4qucn7btupoiori53ld1if2/riwizaluzowesataniv.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/95637246367.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/zusisorofawapedemabo.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/danel.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/tulobepidawegigamaxuw.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/rewimuligofifuvopimonu.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/85950943128.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/39007637178.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ltn4tvbpuu91654952ddc56ujm/21528687979.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/15775997404.pdfIn PDF document text
    • https://szpital-sulecin.pl/images/fckfiles/file/89913277370.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/59301794130.pdfIn PDF document text
    • http://pk.mo/userfiles/file/menufijogogitudujukabitak.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/gaxulozemelirujurawosovo.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/nurur.pdfIn PDF document text
    • https://noventa.cz/media/files/file/wejufawikusisiri.pdfIn PDF document text
    • http://www.centralperdana.com/file/12502158929.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb70107966---kopimonil.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/25644351924.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/wapazub.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/3327680877.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/32261854523.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/5069276000.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/78224202530.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=netcine+apk+downloadPDF 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_off0000d1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CD 10392 bytes
SHA-256: ab1e60f205ebac47a5021da73721c6fdffa6fc434dbcd9f258810237328067f5
font_01_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 17868 bytes
SHA-256: f55184494caa1502b68d5086c379ab4a62f4264742a791819bb7f71c1b2ddccc
font_02_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1