Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ed62cff6f81bfd…

MALICIOUS

PDF

72.8 KB Created: 2021-09-08 03:28:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 93ae26479dd71c054d2b347c2422980d SHA-1: 8f398fe5fb1ad74bd510c9e0814576f59f764c7c SHA-256: 38ed62cff6f81bfd4f44c4d0709ae3fae01d03efc2c9b2f7bd257b8ead9ef050
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests an attempt to manipulate search engine results or distribute malicious content through a network of disposable links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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.tamilsaga.com/ckfinder/userfiles/files/48163714964.pdf In PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/i29d2d6b7om8f02a1nr2i4er2m/kozanufut.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/wevibolax.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/19941442730.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/wirufu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/5047e6bfc54b7d962c66e22dd91195f5/46487672579.pdfIn PDF document text
    • http://simonide.org/userfiles/file/42091122908.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaa109c32f---malamavute.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/jumamirosidewaged.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/75818621507.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16105d9f54876c---valosimegawozinolanejefu.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/wevukimovij.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/gopebelavipawixogipezasar.pdfIn PDF document text
    • http://mcleod-bobbitt.com/clients/64742/File/suxanuwogagid.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/wipevilezazevevuzezo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db941c8d510---jafalimuv.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160883b7a88ac3---63143021281.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/57294720882.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16116e387476c0---66912449770.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/lugekebi.pdfIn PDF document text
    • http://hopkins1983.com/clients/861771/File/tupulezojojo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63badd1a2---xewibe.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/7199222382.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/galuxuduridixinuvinobelif.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/5b7612f3dcf98dba0481b84d430909a4/76584542952.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/98278494093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=oracle+pl+sql+documentation+12c+pdfPDF 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_off0000b811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB811 16792 bytes
SHA-256: 2962f2d8dfb18248fb3a447af0573dca57f54f088c95bec52846932942456e68
font_01_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 11224 bytes
SHA-256: 040a9e590dcde04b8d80668c9102b6c29ef4c63a5a88b9ffbbcdbfe13020bcb1