Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ea9e0d3161693f…

MALICIOUS

PDF

86.5 KB Created: 2021-07-22 00:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b7d0e459e13a618a851db990664cfc44 SHA-1: 1821aabcea17530d983701d772fce1c0a81b09d8 SHA-256: e0ea9e0d3161693fc27d73f9f68b81dfedc7dfbc98f5cef5377fd0f7c571a466
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://alibabashipping.com/userfiles/file/juletesutagodagari.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6aca464c2---kinubiwelifegeb.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/nosemisojo.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/4a1f990d9d56cb72f77f0c338e385214/62409188582.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ef66ad46---82666651308.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ac7en9nk3v65s4mte625o350tj/58686724682.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/69590109532.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b95d3aa00b---5437612034.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/rokunopukezu.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/1344434744.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160900097229d8---83586223674.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/16885653461.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/tuxelawigifetamogumaxusij.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/23654062710.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/4359462964.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/7427446355.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/37060416109.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66478f148---56644506811.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1cb7fbf014---99914578785.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/jamegukutejaje.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/40047005311.pdfIn PDF document text
    • http://firegallery.ru/img/upload/dizizufawifatonu.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/94595120532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hiccuping+while+drunkPDF 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_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 10516 bytes
SHA-256: 2a5f7bf65dd0f0835af61f6cc6b6c73620729316954d988b204d39275ddd17b4
font_01_sfnt_off0001062d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062D 17420 bytes
SHA-256: 664bf372ae565517aefc560cc5a0e0ab9293ed18343ddcbe9395b80efbfd1cc8
font_02_sfnt_off000133f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1