Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9905a756095a78c…

MALICIOUS

PDF

99.6 KB Created: 2021-09-03 07:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48c74edb68ddebb576f234f9a88bfcb3 SHA-1: 9a62d81b4f5a346bc25412ea02faf1a29c6b8021 SHA-256: c9905a756095a78cd8195267d16edaa0da89b3150b23f9fe328df7df6fbf1b97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, pointing towards the distribution of malicious content or phishing pages. No scripts were extracted, but the overall structure and URL analysis suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://sistersaviopublicschool.com/userfiles/file/16929312373.pdf In PDF document text
    • http://oreoltour.ru/sites/default/files/file/70678445158.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/97098989468.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/nqufd9abam0be8d8g615e3q0g8/lejefezunomokite.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210815070849.pdfIn PDF document text
    • http://nmglyxx.com/userfiles/file/matamobofikapun.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/neposeg.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/e470653169eea9f92913b2cf6790cff5/voxaxaruluritifina.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/47009497084.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/rapejatusisapavi.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16078156b2df80---60827885137.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/83731056160.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/61592133552.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d917c5e2ce---lodegotiripose.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/26315182700.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///25299963448.pdfIn PDF document text
    • http://metapolar.hu/tmp/68738434053.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/10201953263.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/14164f1075461e272cefe926ee05a6ad/34193902864.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e60c263588---57453482485.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/8948235981.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/zexuminatuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nordic+hooded+scarf+crochet+pattern+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_off000121d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D6 17784 bytes
SHA-256: 1f6ca8aa9e6daf33bb69490f9c26c7441fa9d2540db9cafd862e952fd4ec6ad7
font_01_sfnt_off00015013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001682a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1682A 10648 bytes
SHA-256: 145b0018abeb778f959bde22596c7f3d736a6f86d200735d40de1abdbdfa7e0f

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