Malicious PDF — malware analysis report

Static analysis result for SHA-256 587ef0c1563ff26f…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 08:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3d35542888b4505ab0631ac7f677f5f9 SHA-1: 088c781209fef6a1a228b60867426c61a7eba6c3 SHA-256: 587ef0c1563ff26f20861b11eb10fc3031d585bad1246aa7202dfb5c6c4e123f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate the PDF acts as a link farm, directing users to various compromised or disposable hosting sites, likely for phishing or malware distribution. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.privathospitaletkollund.com/ckfinder/userfiles/files/galumeguwevogi.pdf In PDF document text
    • https://mehreganimaging.com/images/upload/files/vumodotupavojipikafeji.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b60b051f412a31951bd5d93c133ae240/norologeponuf.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/zigoviparege.pdfIn PDF document text
    • https://salonrewards.ca/images/file/85439745515.pdfIn PDF document text
    • https://expomediainc.com/upload/file/13754987835.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/vimelunenol.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e35d9de008---12071865860.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/kabifijexaxijir.pdfIn PDF document text
    • https://ribaczpeter.hu/files/file/72768014877.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/vizij.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/e0af27e4173f1555dee745fbd733ccda/xikimapadepakuw.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/10525575601.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/sazojerojaxag.pdfIn PDF document text
    • https://hoavily.com/uploads/files/jowegagekakutakenu.pdfIn PDF document text
    • http://marketingnews.fr/images/file/39946887222.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/likudiralulivetafu.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/17449604540.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/ziduzaxolegibifedigigen.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/nirozalokebegan.pdfIn PDF document text
    • http://levotst.com/uploads/files/zabewesona.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109130406328499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=medical+words+that+start+with+rPDF 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_off0000c58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58B 17284 bytes
SHA-256: 6b7c48b756eb475c44293770cae5419060c0ad6e773f673ded4f17d702efb3b7
font_01_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 10440 bytes
SHA-256: a6f9914b58f0a6d78e730489e2ecd2ef6166ea86b6ce4384ab444e5953bd6da5