Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ad811c6b87addf…

MALICIOUS

PDF

168.6 KB Created: 2021-07-27 20:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 82ba2077da75f994fa53e68aad501dac SHA-1: 7fd2183d33f1e8d547ac726b830e00c8eb2ee55d SHA-256: 24ad811c6b87addfee541be2f1b8b949295f5dbfd7ece59c3fca42d1b87730de
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the URL structure and heuristic firings are sufficient to infer a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9519

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 http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81a85e4990---tawinez.pdf In PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/391553b779f13be63e0c94e5bdb5f7a8/gexazodoxipakoruze.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/91487108220.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607312ece2276---1927542481.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/83864754581.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6ede77050119d51bf4af32e40406ce9a/xoxejivuwe.pdfIn PDF document text
    • http://stevis.cz/files/file/723840712.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1623871040793778450.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d7ec348fcf79375ad179124f0d7e0c5/29864907939.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/pipodotidalos.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/39067101215.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078b6fe4409b---wawijinudotumozexedik.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/22566260112aa7ab0a1ac2c2d6b54c7a/67881977210.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/xanifatijafaju.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/gekogaxukigamaluruv.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/6062210691.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c655895a80---jebibagobuzozotowilukab.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1tobe0iicug1oslvjhh855ovm0/90793959650.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16095ea2be93f4---jujalirufapomefaludu.pdfIn PDF document text
    • http://keramann.ru/uploads/files/vitezinunakutinuvoxeg.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/pigodafujux.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/36354167551.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/03768c017eb8dba49d3219a326fb5f20/81765965771.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zobokabadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+disable+alarm+on+hyundai+santa+fePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22172 11052 bytes
SHA-256: 81b874f8b3cac5086b19ca9f25001a6f3b98996a8679e904aa5032ba8a49dc19
font_01_sfnt_off00023afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23AFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002530a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2530A 1988 bytes
SHA-256: 6b2f43824ad5fa079027f6124f3a4ec13044ba9b23b509f2df3d09a54c1bd94f
font_03_sfnt_off00025c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25C2A 22776 bytes
SHA-256: 8c7a199b13a4a5f21ead3d8ef8e370d5ef1ff6def8a8b5735e89ba3b63e35bd6

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