Malicious PDF — malware analysis report

Static analysis result for SHA-256 469918191a8cba4e…

MALICIOUS

PDF

72.5 KB Created: 2021-09-09 22:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 67bc9d736fcb74ddd83dcf1254922d32 SHA-1: ac6ed8744ac3b3fdce88ba29c1015bed1d4d3e59 SHA-256: 469918191a8cba4e528186be2683f243282b8f5fe5c9d244793dcdb40ec39cc2
164 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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://phutungtdc.com/upload/files/43908903688.pdf In PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/18085140476.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/gowafi.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/86003301176.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/14275260447.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/32525938837.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/36539726274.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/51913800837.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/89159002425.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/dulutufamoranakenanoken.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a058dad38---gizexenujopane.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/karur.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/72525465257.pdfIn PDF document text
    • http://ekmeta.lt/failai/file/felonuzir.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/bamifomise.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/12948508502.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/dilenatorusufiramuju.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/kivomazip.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/kewanozezew.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613984918247a---34365504524.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/9318886446.pdfIn PDF document text
    • https://fajanav.com/aym_image/files/sojixidej.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/juvugimudepat.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/5bromaet5487ovrco38gr4sjbe/16308398189.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=earn+to+die+2012+part+2PDF 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_off0000b9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F7 10448 bytes
SHA-256: 3cdae1865a1585fa6a58511e60e036b40b30ffdfd56022e7f8f8430dbbfb276f
font_01_sfnt_off0000d1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CA 16680 bytes
SHA-256: 4b33f88a88393e57255e7cea53cc902dde5d7fb48a816656e33a35d823b2835a
font_02_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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