Malicious PDF — malware analysis report

Static analysis result for SHA-256 f299f17eea9da40f…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 03:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87c278c601d67c89a393a8efbc1a7eb9 SHA-1: 7fcc6cc7d0423a7fb78c1cc66c2b6e3595f06c4a SHA-256: f299f17eea9da40f4692fe338ab18a42f3667acc560840d7daa45e906191e00e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites. This suggests the file is designed to lure users to malicious sites or download further payloads, consistent with phishing or malware distribution tactics. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://dalnoboy.com/data/filestorage/upload/files/suluko.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8082d0c80---gisaj.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/bo32tk7r87abm5c7lb16tcd0eu/kirogugodi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300cb909b43---94554254819.pdfIn PDF document text
    • http://rahwayhigh.com/clients/42761/File/5436846781.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/38b2d50372f9ce5b20d11d7a6dfee19a/34072851909.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/343192628a91ac58a52d1d7a7c92e586/17525628537.pdfIn PDF document text
    • http://congtyvima.com/images/Download/kelofeluxefiduga.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/2916958968.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/defivurofimetovigevokaf.pdfIn PDF document text
    • https://themalc.org/files/file/98478774047.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/18656801932.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/rnjbvu9sh4mkkc7upqbmogkuc9/rinomudizigazidan.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c564249ccaf---dekufevomopaje.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c406e328fb1---70743044948.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/15361134594.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/kizijewidezosesonexogapu.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/98312129574.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded8bb4657a---50170457564.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3b9b7a30---19872245027.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/renamudosux.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/mupejuresode.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/burezodenepomaxabenigijo.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/xumeva.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/fawutedogilego.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/79565711505.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/m3ro7oflobf9ncqghl8rc0jat5/xazijulalerisukenabukapes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=compare+to+series+series+feedback+amplifier+shunt+series+feedback+amplifier+hasPDF 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_off0000c265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC265 11248 bytes
SHA-256: c317ee985dd5b3f0fe40ea23d691c18900e9be1af62b75f2727399209e0cf7bb
font_01_sfnt_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 15516 bytes
SHA-256: d93c7cd321f148658c738016806123ab78f9e0a31488112355cff31a34240e32
font_02_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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