Malicious PDF — malware analysis report

Static analysis result for SHA-256 969c36b1018200ab…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 05:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c05fca51b2e3edef929387a271622cbf SHA-1: 07b5a7d988abadec1ed32fab5851a4e7a051b827 SHA-256: 969c36b1018200abf154689b2df88b7356a804233624f410c78af3ae0477fab2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Heuristics indicate the PDF functions as a link farm, with numerous external URIs pointing to various websites. Several of these URLs are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://sahyadrisevasanstha.in/userfiles/file/7913406703.pdf In PDF document text
    • https://stealthwindow.tw/uploads/files/202108232026444466.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/32313136335.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/wuxirobig.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/ginevonokir.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/15593815575.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b83a0b3ee62---dokusemanegug.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/41688687229.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95eeb7ccc1---zopiseve.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3479c2245---53944438127.pdfIn PDF document text
    • http://dnepropress.net/files/file/66662719479.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/rewebubolejoketifozodepik.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/5812691607.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/roxuzusapigikejal.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/58576286945.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609862bf9e85c---pomudavadasade.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/auhcjkiaumhr6ig7mlbifpc74i/50253464230.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/d2b6b56ea91db09002a197cf9224d25e/bikikidafof.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/38642318610.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/3308372814.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/sijefubigowobasedak.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/63868121088.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/47944069968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=tcp%2Fip+protocol+notes+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_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 17636 bytes
SHA-256: 5c358600593797274b3b937d65a5f5af2d54385d639999d9662a66de8feecfde
font_01_sfnt_off00011e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 10448 bytes
SHA-256: 500b480ebec8d96c26de5289004a3529ec845f0251f4d3eb3ed109a28287c45f
font_02_sfnt_off00013664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1