Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ba218dbc6b9f12…

MALICIOUS

PDF

76.7 KB Created: 2021-09-14 05:49:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6cd39cd8f873bc258cbf6b8e2a5e4d41 SHA-1: ea9fac059e3143b8b0a5f0730cbde8b26ff1fe3d SHA-256: 25ba218dbc6b9f124b1df9f8c8e31c8ef5749d5b1729fdd42ed58297162c5060
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are associated with link farms and potentially compromised CMS upload storage. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure malicious destinations. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a trojan implies a mechanism for delivering further malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ketchas.ru/uplcv?utm_term=real+hack+coin+master PDF link annotation
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/60368911008.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/maxipivipidawaguzutotufon.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/rixobeliloferinelufojuxa.pdfIn PDF document text
    • http://becucci.it/userfiles/files/sefuwumobera.pdfIn PDF document text
    • http://trubaopt.ru/content/file/99412122179.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/pabaxinomameta.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/59680220127.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/48kolh400uqlke6plgsklnug05/mufelugajubife.pdfIn PDF document text
    • https://rajaunited.com/contents/files/vakegidofezuxazupukiguj.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/53080553318.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/gatop.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/91012468088.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/xusizuluzedufegamedod.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/64890412064.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/jexanuf.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb390829d---47911065936.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/63438400271.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/21791688605.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/36903078446.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/v3tg8l98oj83l0qfdmdamvcfai/vupikiwodizejog.pdfIn PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/42981474203.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/0d785ca97fd0c2de66dc22ec44ff5a4d.pdfIn PDF document text
    • http://lejonhund.com/upload/xumifedoregalololatugawu.pdfIn PDF document text
    • http://chieucoingason.vn/files/29241487676.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/18134105719.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/nusasome.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_off0000caee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEE 16260 bytes
SHA-256: 6aacd15f74936dc8d965a5c371dd76abf7629727c6cf1824a762a154267a2a4b
font_01_sfnt_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBD 10632 bytes
SHA-256: f6fce32feeacbe49ace542d54ab86bee67c4cfed2620c0f064d3c80d4135c778