Malicious PDF — malware analysis report

Static analysis result for SHA-256 956a86842c05f83f…

MALICIOUS

PDF

88.9 KB Created: 2021-09-20 03:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c54609a102d754b093123cc548911805 SHA-1: 95bd9d9b33b85d964e4d3a2a1070d45db204bb34 SHA-256: 956a86842c05f83f159f0bffb548c0e076ad1f5dbaf937e565dfd05f53bf667c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute or host malicious files. The presence of embedded JavaScript and external links indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://szsahsh.com/uploads/files/17588849111.pdf In PDF document text
    • https://ivanda-commerce.hr/userfiles/file/59641828915.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/93411148531.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138eef0b4ba6---lekonozozoragijin.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/zegumoxekuzevud.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/19592232740.pdfIn PDF document text
    • http://hadt.vn/upload/files/85689349729.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/82103626238.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/powodidito.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc678f031---niwijopisemamo.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/musawo.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/3443334018.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/misimuxibonadabexig.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/wawepege.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bae0bccadcc62fcf3455a78336f300b6/22481659992.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/mikulumusutizoletegex.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/96728830434.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/69475977871.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/kejosa.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16132ca811ba55---minegonak.pdfIn PDF document text
    • http://patrickstaxi.fr/userfiles/file/domedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=jilebi+malayalam+movie+tamilrockersPDF 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_off0000e9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B3 22524 bytes
SHA-256: e356e25940213ba6949fac4e249a4180f15de30907091e259172b05e9009efc0
font_01_sfnt_off00012353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12353 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6A 10688 bytes
SHA-256: 0323bb8c895543924cd1536210a977886035e93f8ea7df314d9275739dc632bb

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