Malicious PDF — malware analysis report

Static analysis result for SHA-256 870dc698ae814089…

MALICIOUS

PDF

140.7 KB Created: 2021-07-07 00:49:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b2e11de45b472c26293503404e7950d3 SHA-1: 21cc26b6e92952526c546ea8746fedf32c1349e6 SHA-256: 870dc698ae814089b38a3f1aa7b8448ce237b5323e657ff1d8b219c8c8388424
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://irlanc.ru/uplcv?utm_term=science+of+being+in+twenty+seven+lessons PDF link annotation
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/208872fa30fcdefdbb3c5fada2011f23/54183032219.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/b31ffhc1380l1evrhge8akqim3/43726667744.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/sojukoso.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/ede080bbcf1629a6f54d49506e031f2c/39142108345.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a86acc433f5---fukukefojazugemo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160784fbf4bf9f---28354037792.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/giboronafitabisevomefareb.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/36431551074.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e865bd92f5---sivajedajivinemagu.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder//userfiles/files/zapoxisiwezude.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/nipega.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/72413769856.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f871d69adfea6c564413e3484f618e04/28925224112.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ef593606c---punazop.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/gadefoxidipevovisel.pdfIn PDF document text
    • https://arerp.kr/data/file///39336475708.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/6ebc4402f84c70bfcb003af45bc80ecd/womifilus.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/78bd36d1c85003de372dc951e0bdb4f5/revamovu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74c7a4dd55---zomabeledepotamotiwu.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/xotanifovobituvujeki.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333123fbf9---64470618988.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a868efe488d---munaziz.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/be32a7f18873602db8cdab1342e6a135/78311481051.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/mavowiwu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C53A 17380 bytes
SHA-256: 48c233db49f3b453eda03a9888af2440b383daa6caa70b37276a6bcffd7f5337
font_01_sfnt_off0001f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F24D 10728 bytes
SHA-256: 006be2aa524cb5b2a4ed2af24699e306d2324867145ea164c6b8188a0f455091
font_02_sfnt_off00020b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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