Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8f1495b8edd5d0…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 19:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 742c836111b16098ce2171a25bb16772 SHA-1: 2e2971d3fc8ddc0cdbc4c4842279341917b638ea SHA-256: 6e8f1495b8edd5d086c18081de3f5f7c84927955139252d92290813d912aafd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pixomot.ru/uplcv?utm_term=opay+cash+rain+apk PDF link annotation
    • https://www.rapn.ru/ckfinder/userfiles/files/79036200447.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/38860278290.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-11/20210911111919754964.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/nunubekide.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/rabuvipifezizufekosajisif.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/vozubejiwononeximimuv.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210913_4C7001D209B7E939.pdfIn PDF document text
    • http://hasyo.net/files/file/zogefilopaw.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/dujim.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/10100958016.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/zedad.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/tozeb.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/3279317726.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/4908874771.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c4047738---refonefelonixob.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c5be8a546---55514665163.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/kuxuso.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109080452222316.pdfIn PDF document text
    • https://pankajplast.com/ckfinder/userfiles/files/zipigijew.pdfIn PDF document text
    • https://trexanh.net/upload/files/95360140924.pdfIn PDF document text
    • http://neteyes.eu/editor_up/90563479622.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/xogifivebixamemulif.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/rewirudimexozazozojowuwe.pdfIn PDF document text
    • https://anakmeong.com/contents/files/netunujosidasaderewi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315053ddc7f---79397590165.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133161071c05---nomiwifudemijavigu.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_off0000dc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8C 18496 bytes
SHA-256: b3ea179c3ba0a7c5bef46d8f477e3fed15229aa2fc9d3aae020f38ac48de31de
font_01_sfnt_off00010cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC0 10304 bytes
SHA-256: 68ecafbff1c9907ea03cfe25a882efb1b79a22c0dd4683cdd56f5e8a42cb0733
font_02_sfnt_off000123fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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