Malicious PDF — malware analysis report

Static analysis result for SHA-256 629e148e4010a939…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 21:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 023f276022700f153b809ad2d21b86db SHA-1: cca8b2164e3294a1ca978515807066a3137f03b1 SHA-256: 629e148e4010a9391e672bc27902c3cf905394244671c84f5c55f5ec7e67739a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=best+free+tv+app+for+android+for+indian+channels PDF link annotation
    • https://exam10.menapoint.com/app/webroot/upload/files/kunuziru.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/71445311901.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/28788554551.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/49412635208.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e734efe49---14838817369.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109011948434240.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344c04ef398---26153415534.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/pituvugadapuzifawikawa.pdfIn PDF document text
    • https://themalc.org/files/file/5713192169.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375495eff37---vufemusodijawiwusareg.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/zugeremozanowuwelepu.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/walol.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/6822809692.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/53715408345.pdfIn PDF document text
    • http://labsshop.com/d/files/86773194297.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/mewafexosumu.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/66289642286.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/36147473523.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/norow.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/59157152266.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/pojalusege.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/dafatofetivoxad.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb08f446bc---32236002107.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/13567657907.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_off0000c55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 16308 bytes
SHA-256: 33eb3c4822c11e8068a66e30af95355e92f4b9d168130d6be95a00acab884e34
font_02_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 10836 bytes
SHA-256: d2ce87a1cc39adb0a8d6e28818a83d2f5624125f483f0b88f8a4ed3ac197b0a9

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