Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa0d72e47c9867e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 13:24:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6fa3674796a466eda181d3ac3906c65 SHA-1: eeef5b0739264049b9aa8f384c869ef30a51f9e7 SHA-256: efa0d72e47c9867e2162ed03afe3c054d19ae7a08d4fe7a41b06f58ae52165e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a phishing or redirection attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=david+morin+classical+mechanics PDF link annotation
    • https://tekmaker.com/upload/files/zewef.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/lupojewabamupiregita.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/basagivijalo.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/widunilegeme.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/jadaneturariburotub.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613048e0605ba---5658838866.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/masidonelinemekud.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/susapidorosewifeninuvaz.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/gumogawoxam.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/navasuxedukejaputuri.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/32606910670.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/51486680047.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/virozedivuvite.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/12178793652.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/61888124921.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413dd98144b---zenafutegaf.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16144ce995ee55---58158911788.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109012200412016.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/79262053042.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/19104490127.pdfIn PDF document text
    • https://www.aledrukujemy.pl/ckfinder/userfiles/files/bisojejexoriwupulu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132229fb67e5---xozet.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613787260e11b---lezimudanunadexotuzewow.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/7438073487.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_off0000d4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B0 17424 bytes
SHA-256: 151dd8bf9d1b622f977a7bc0aca121bda73a41d5c91953ed4233e5bca63d6310
font_01_sfnt_off000101f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 10604 bytes
SHA-256: c9108a50252226e6dfd7cebb955b78d5d8e7b83b6523db3020e71668ad2c124a

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