Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba50c44e76cecb7…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 10:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ca0c87bb28a5326fdb72f96b8eb2910b SHA-1: 46a74c44f7c7eb75e045a8128e70fc0e1366adf7 SHA-256: dba50c44e76cecb709d0ae9dd8a33a3ad2457f0460546a5e0ab830074001a757
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple potentially compromised websites, as evidenced by the numerous extracted URLs and heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM'. The primary goal appears to be leading users to phishing sites or further malware downloads.

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://archism.ru/uplcv?utm_term=free+movies+online+m4u PDF link annotation
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/19629462131.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/maxufan.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/sepozupimaviwobavi.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/78130917992.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fff53a11e5---vumubobiwotaseriwu.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/77tvt3e43qd47d4mkdflsndlan/75142251885.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/88528426883.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/43875005551.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/9127161206.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f6566b4af---56001859197.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbd934261---10549593616.pdfIn PDF document text
    • http://electric-kernbichler.at/mumujefasedepuva.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/lilifurevugu.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/860baed64b02334efb09338059c0a0c2/fidamotarepevowufowali.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/romoxewozawawizulizoden.pdfIn PDF document text
    • http://basar-hemeringen.de/ablage/userfiles/files/vagutatixezuzosajimowigig.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/dewuvajerubefukusisudon.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/77463869683.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/somima.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109032301192436.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/buvimusuzofasu.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/lutoluzafaruzejateva.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/tomutitoto.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/vemimakekizuk.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc85cea8fc---44341324617.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_off0000d3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE8 16952 bytes
SHA-256: 94e878a47e34bbc6d262fd78dcbe338228399915f7da0d16832431c5cf48b8c7
font_02_sfnt_off000117ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EF 10232 bytes
SHA-256: 8756374a0ebba27bca2f355fef49039a23a96abff9e124b7c9203387d7f63d1b

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