Malicious PDF — malware analysis report

Static analysis result for SHA-256 35222590c4209352…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 15:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b9ebde813e8a242e4a711f420ae9198b SHA-1: 1e96a66bcb8cea906d1e40cce31d32afaf08d73d SHA-256: 35222590c4209352533dab5e1672bf201b1975b8ffac3ecd4f4bc1a9e58faf50
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggest a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of a second-stage exploit or downloader via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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://allytemp.ru/uplcv?utm_term=single+parenting+books+pdf PDF link annotation
    • http://70sromans.com/clients/871711/File/xunijobigitolej.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e498b6f12674a47426a7de32ea2c16de/48375200926.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/62779751849.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/riwitikefumowow.pdfIn PDF document text
    • https://businesslife.com/content/file/41362212131.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c37c7a714---jebujowidopiki.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/39900008677.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc874aa00d---95003488311.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/22906530291.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2bd5ad17735b90787ce01560eb594be6/jarabebibarepaze.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee92b9bc4d8---59609755518.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/85139467046.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/bagotuwapus.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/4445412650.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/828e01b5209b2902117640c87d57af35/xejusujoritekuw.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/76153293688.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/723aae778ac409adce34be7d67702a35/xedajubupiwe.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607174f246aae---89787629318.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/zubew.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/mj2hrd47oc4u8jt5e3a6fl3rrq/jisuka.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16080b66e81689---66202651777.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/usq6k6kokv6a6f5qbq7k5iiv87/xefukejonixi.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_off0000da22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA22 10980 bytes
SHA-256: 7664c72df40614621c1821ab2cf631a674c0600002a19bef357b21c17a91c8c0
font_01_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 17156 bytes
SHA-256: 963c9ea39aa49253dac87232ad448fdf10c47e9fd3e87f56a9a04e4affd0c8a4
font_02_sfnt_off00011f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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