Malicious PDF — malware analysis report

Static analysis result for SHA-256 4053c271f4338c00…

MALICIOUS

PDF

87.3 KB Created: 2021-09-05 08:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 505758a5b740c3d4edeffcd4a24c1c2c SHA-1: f68c1e6521fdd45e0ec119e2977f5a337c5ea50e SHA-256: 4053c271f4338c006197e4ebef083a57d5414e650ea6d0ff461e733f4ca3a0ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to distribute malicious content or phish users. The embedded JavaScript suggests an attempt to execute code, potentially to download further payloads or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5191

Heuristics 7

  • 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.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://mkngsp.ru/upload/files/22263639818.pdf In PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/zenolexej.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/gvunmv9d8pnh3tirghsparcqe3/76086256269.pdfIn PDF document text
    • https://olterus.net/contents//files/32608023839.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/40187081266.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/74451378261.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/reburusewukikexeforala.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/ruduwaluxipamo.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/bec7d0513b6beea2ce0c39ddd4c50528/piputiforerepaviruriviv.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/kivixifikerirosizo.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6565938bdb---51793919173.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b78b13009---78339935449.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b63412b70e---dubezusivaxezegorajurefi.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/93109000986.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/jesolotesadilavuwiram.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e4ac0793e18efb476db7e74b595e3b05/48725425301.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/turanisojapamojix.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/5650bc14ed96aac4797491d1daabedfe/busarivazimenilixizofiwa.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ca33b5661323afb0cf7ef6cfe8146759/69739823340.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609b18fc9744e---wofemenozifobevipinewarib.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/97a8ecc297775735b5b086a513da5e6a/11830420795.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/98464632630.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/bv33kuf84kl4set0ao296ds0rs/88382748842.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160868f6f1ea16---80084222203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+world+is+too+much+with+us+analysis+pdfPDF link annotation
    • 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_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 18888 bytes
SHA-256: 7b225f392bdb1599af9e847209b24852e8f71646f8df7260edc86b9e7f949229
font_01_sfnt_off00012b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B99 11148 bytes
SHA-256: b5f51c23f5c477aaa74f4805ba8023f6e5641a480e0f9bdb6a8a4d207dfff742
font_02_sfnt_off00014595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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