Malicious PDF — malware analysis report

Static analysis result for SHA-256 5105b396c6de5717…

MALICIOUS

PDF

82.7 KB Created: 2021-09-18 23:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c806e82dec0fd7bd5590845ff3e04aa SHA-1: d1b98cfadc0a2079e7628569aee90f45ab93ee2d SHA-256: 5105b396c6de57173fa9150655f604ebbe48ec59fb2faecf3780d42fa15cb602
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm designed to direct users to various external sites. The presence of embedded JavaScript suggests potential malicious scripting, likely to facilitate the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://philabc.ru/uplcv?utm_term=best+video+editing+app+for+android+with+effects PDF link annotation
    • https://conrays.ru/f/data/79164569376.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/73725162161.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/zajedikisamemogufenimiw.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/xewuxekuxagib.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/72249466349.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/pazidumijorupubojufesakad.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/2737756739.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/3307825762.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/semag.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ve0fp169var4do1b72aq0qobs0/dilodipemoganoluwokotuku.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/navafifajure.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/10398787871.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/11549799568.pdfIn PDF document text
    • http://agmapure.com/upload/files/94423695405.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/53732512327.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/92289205366.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/mawadofokofek.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140839bd6c9c---97564505467.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/f7f8335056faf97094c73bf056331f6c/wikapepeb.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/17038383723.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/nekuxawasosul.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/68518240320.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/73284521275.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/zazuxekekonubowesexelunez.pdfIn PDF document text
    • 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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 18112 bytes
SHA-256: 9b5f25991f47fae44da5d6602aab79e6f422f6406660520ffef80776a79414b5
font_01_sfnt_off00010b7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7F 11056 bytes
SHA-256: b2bfae31a240d309b980bf9dad6b79ee4f5dd5d7580df53e9979b5809b9deaf8
font_02_sfnt_off00012522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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