Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99c0e6d21f977de…

MALICIOUS

PDF

94.0 KB Created: 2021-07-19 08:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 024303c6a7b8f35cc116ff9fe5548cd2 SHA-1: 2352c6b391dc82c1e365b541d5c7dc18f344135f SHA-256: e99c0e6d21f977de1ee5cdc95122cd355cbda76fde1f2e1b0a4e5d11230d15a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely intended to host malicious payloads or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075853f47bd2---7182950478.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/aav1s2628vdol880cmp82dinmu/38349749605.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e29a343bb517447bb86e1f2649ae061e/damasujiraxipukuxab.pdfIn PDF document text
    • http://benetalent.com/upload/files/vagijonefejasotagowuwu.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/setuzubebeloge.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb01e08b133---12371597725.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e5dac4d1---ledenexibokuviwimopupora.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88851874cd.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/46747459533.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d784955a97d---zuxomalefifevolizusil.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/t2d4e89l5s7p3s74lju5dloeb5/wilasojemu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/16c95cdf27d7ea0ca3efc7d2cf506ca1/sirukisusanusotemajolifuf.pdfIn PDF document text
    • https://susta.vn/userfiles/file/60461448879.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/78db1b740057a9fa461f2633865fdb56/raxofezaxisowenudikur.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6591371654d4d1f34e0335b233480149/24534043491.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/xilixagewalodi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ada05e8dd---wadusa.pdfIn PDF document text
    • https://castel.ro/userfiles/file/4585671521.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/afadc27fb193a3520cb0c7dc5b44e79f/91021959595.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/e0k86fs3i8pt5q4gh5b6ld0bbt/fumumivugu.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/87712216027.pdfIn PDF document text
    • http://rajeshjshahani.com/clients/d/de/defaee86e9f1fedea086b53a5072ac2c/File/72744001482.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/dixejojezujaxedivetibuxo.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/0d082c83accb6f88cf51e9c41b69cb41/nesosuxonebuduni.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/99839323497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=i+am+woman+songwriterPDF 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_off00010d1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1C 10444 bytes
SHA-256: cf7cb0670baadbc231350fb261a8ef3b14f458a739d5396a5ab0544ed3152c50
font_01_sfnt_off000124db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DB 17540 bytes
SHA-256: 94aa528b85201c6414eec1bf9181ea8a3ec4b6f429d287f7ca10538e51bfbec0
font_02_sfnt_off000152b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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