Malicious PDF — malware analysis report

Static analysis result for SHA-256 118e489949502c70…

MALICIOUS

PDF

88.9 KB Created: 2021-08-02 23:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0eaddd66f681199776d855163900ec16 SHA-1: a407c21ee2abf56c8b4c6580e058f657c52fb9a2 SHA-256: 118e489949502c70f1ba7fb1ab8c4e79be2b4128eff7b4aae9d885bf092381f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware disguised as educational materials. No scripts were extracted, but the overall structure and URL analysis point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • 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 https://krisoc.ru/uplcv?utm_term=free+maths+olympiad+worksheets+for+class+2+pdf PDF link annotation
    • https://xo-sound.ru/userfiles/file/62615009010.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/77499508091.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mepovofokopifafederopaj.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a124d2063---wojotijutelu.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/bejiroripegifil.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/sowivikudejep.pdfIn PDF document text
    • https://saam.vn/images/content/file/36013055620.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea16f0c5bc---zarikezemomasesuvur.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9e6bd0d6a---kagubuxitone.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/satedepovanopudo.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/dbfc639b04f5105d6f8fad073818084a/jugovefokewilotukek.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/17496932521.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a348b035ffd---67774574913.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/kikuzajifo.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c0057a911---98450370551.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/11987722708.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/19265256083.pdfIn PDF document text
    • https://uniqrelation.com/userfiles/file/81779310942.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/fadavatubojomonal.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/nopedadofap.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/fqqth9ila78bubp2p0b6o76lg6/vinug.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/3d942f83327a7d7793a0a40346db9d24/xusejusag.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f867af71c12---naxodifabebujumidamum.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/28002720214.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/63ede3505cb5bee1ff9d0c9d2cbda311/zepabiv.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/63047380697.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/26442607211.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_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 17796 bytes
SHA-256: 722854d74dc883d01791cd2b5599aff801d46b25243c3baa86e8b70aec18a8b2
font_01_sfnt_off00012302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12302 11168 bytes
SHA-256: 5e61dbd9d34692d6bfc24d82db5bc85968bb16a48216cbd1fd26dd7cb0210fd1
font_02_sfnt_off00013d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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