Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da9b209ba3c5f64…

MALICIOUS

PDF

85.1 KB Created: 2021-09-11 18:11:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e80639148f3bf9a346437ab171b0edc SHA-1: ecb6def4d958f59e352c05ad2449ca3189fe0709 SHA-256: 6da9b209ba3c5f64cdc7e591709cb09c3c0cb38dad6b220cf69da0ff2dff4104
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a link farm pointing to various domains, including compromised CMS uploads and disposable hosting, with one URL specifically mentioning 'nba+2k21+mobile+download+apk', suggesting a fake application download. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=nba+2k21+mobile+download+apk PDF link annotation
    • https://semagro-msw.ru/pics/images/file/18753106466.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/nevukifinelutefas.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613744275f50c---5053714289.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/ketitugejod.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/tunufa.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/xoziritubelit.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/bosasinawuk.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/21694118022.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/69425499570.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/gujanipobuwipaw.pdfIn PDF document text
    • https://halkapsikoloji.net/userfiles/file/1241362663.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/sobom.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd4a11310---bagitenixos.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb89423b6c---gujexi.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/13649896106.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/nisokawu.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/gametokofupogafiv.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/67639148015.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/rafinibipukuzi.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210902231154402.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xibikigizifegawita.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/datuwebexariridiwis.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/33020268465.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/wewelezi.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/pcnkmihtko6l52d4on5hhjqijq/vadox.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_off0000da5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 10652 bytes
SHA-256: 02ebddf42a97c974631b3d75dd0f4b705e2234d6c9d2067ebdb05457df82b02d
font_01_sfnt_off0000f29f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29F 22644 bytes
SHA-256: f151866eaa6c0478cbb72d4a94781aabca51f27d33ba27fff09f61b4efd16852
font_02_sfnt_off00012d11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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