Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd26ed9ef3ee1457…

MALICIOUS

PDF

85.4 KB Created: 2021-09-10 23:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 636d5032b4ff8c28c80e82e4ab259161 SHA-1: f86c438e81ecf89493593bf32f18741a265dd30c SHA-256: cd26ed9ef3ee1457010ee7d63d53af560472ccca8417e2fd0e571eda595cd7a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134406a71ba9---xevukozoposopibeg.pdf In PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/vujef.pdfIn PDF document text
    • http://ecole.ru/text/images/file/xemimeruxefidupel.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f345171e1b---42594641271.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/88949783999.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/89224623912.pdfIn PDF document text
    • http://boldogelet.hu/media/nujogowab.pdfIn PDF document text
    • http://bancasemecanino.com/userfiles/files/puxurim.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/66247044321.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/sirudiwewupun.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/cadac47d130b87e1c7a5b53de822fdb5/29674498431.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/43980253485.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161358484732a2---84092456663.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/74582295633.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/gaxunafobiv.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/9j04p1f8vn1vmseqqt2kfvr8v5/58006877678.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210907041034.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/datorokefavoxab.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/berano.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/roratavakifazozivosigaza.pdfIn PDF document text
    • https://topupdana.com/contents/files/24151816702.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ee38d001b9e5146c101e0fe083c8c662/1006211531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+clear+searches+on+android+phonePDF 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_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 10688 bytes
SHA-256: 4a8a62a0dcbdce47931918059288c34c2600872cf4005087ffc562ffe3e06d7b
font_01_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 17620 bytes
SHA-256: 8c167948e77c84e92f9213ee6cb52d23b685652e573c8157f69115abcefff3d7

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