Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a29b1191fcce09…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 00:07:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ef569ccbd7c9e7f40b30ba8037b8baa SHA-1: c9c003f587a0daa23bda41c23e7004a5fec563c5 SHA-256: e4a29b1191fcce09e40d0420331b4c66cfe43382001a2de25c70a56c5c3ee803
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites acting as link farms. The primary function appears to be directing users to potentially malicious content or further phishing pages through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/bbeeac04837a413a2ebba78844dc0f1c/14771545549.pdf In PDF document text
    • http://agecarekorea.com/ckupload/files/vubebokofex.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/55303391534.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/bolewitawabefafudiv.pdfIn PDF document text
    • http://wmehoa.org/clients/d/df/dff1b85474dadb967ea0c40f6d5e37f8/File/42196484768.pdfIn PDF document text
    • http://mega.kz/media/upload/files/75375374868.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/vilujonugidikivojarol.pdfIn PDF document text
    • http://muszempilla.com/files/file/sodamadixujoxuzabedurasi.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/nesotavukafud.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/jirewumubederumax.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6d750fbbc---11380209514.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05156f2a7b---xinazewadesimuwulumazija.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/18693974125.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/93300925544.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/zawodojovose.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021082318594854.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/pidibanibunapowamikowi.pdfIn PDF document text
    • http://recviem.ru/img/upload/38795765073.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/33505527000.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/80d84f664680bd348a71eaf0901ed7b4/437860696.pdfIn PDF document text
    • http://eternoohydro.com/d/files/67347988022.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/38j83op4goaq2rb8igpjgsf9op/30518338245.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/64524873233.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/xazan.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/tikajagajaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sekhar+bandyopadhyay+from+plassey+to+partition+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_off0000c880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC880 16608 bytes
SHA-256: 397b853dec0b63fd2cb61f3c861f7a39c75360b823de5a216e81a930174fbeba
font_01_sfnt_off0000f379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 11184 bytes
SHA-256: 04a30532ebab3678f68ab1672bfe3e155b96a8728c22137c94cf7e755215f75d
font_02_sfnt_off00010d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1