Malicious PDF — malware analysis report

Static analysis result for SHA-256 063c1dd1c108b28d…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 08:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eceac714c76ba919b7d756455ef5bca0 SHA-1: ff91c53bbb6220cffbf56ac381e335e8852466ac SHA-256: 063c1dd1c108b28d92d00458dbc149d3eacd1084571da3d56b23cd534466809e
172 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external links, some of which point to other PDF files hosted on compromised or disposable domains. The presence of a 'download button' heuristic suggests a lure to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maymaygiaydachidang.com/upload/files/vobubisazifizesazam.pdf In PDF document text
    • https://karlschool.org/uploads/files/202109010501308907.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e13c295f---83390901333.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/sipinibojugesofewitumono.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e29c55982a708cf043655e5af4f88384/47380683213.pdfIn PDF document text
    • https://eventaipei.com/upload/files/labezup.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/59245759106.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/69483697157.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/28228398381.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161394cc0b6781---luzipu.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/vezakosasi.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/21107657222.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16139145b565bf---zepopufigititijexot.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/moked.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/vuvumi.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/27116805425.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/jimimuwaremifoxifajiri.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/jilomogek.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/xojonopenejutizixivosepaj.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/75115865335.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/livaretekijelagakakalam.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/xoxadorepexodifuwe.pdfIn PDF document text
    • https://ijpdua.com/contents/files/posujovemimewujiki.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/70369830489.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/76380461788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=leo%27s+fortune+apk+dataPDF 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_off0000df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF88 18296 bytes
SHA-256: f17ccd2dd6fe6e42bc7186241580dcbc93800a7c3e096df1d17bc64a60b063a9
font_01_sfnt_off00010ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D8 10536 bytes
SHA-256: 4d0e7ae11f6eea6cccb48e8835449bd3dbe8337a549cbe2495a10d2592216e88

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