Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa10208ad1ad9736…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 07:02:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c63329e923d8cff90fae9da1586e4a77 SHA-1: 205b3f8e2b1d82af05d51bf349f5941455bb0d4b SHA-256: fa10208ad1ad9736e588a9e7d532cf9cb9c108d7152571db1ba09ee6287a4e1f
212 Risk Score

Malware Insights

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

This PDF file exhibits malicious behavior, primarily through social engineering tactics. It employs a 'Browser Install Lure' and a 'Download Button' heuristic, suggesting it attempts to trick users into installing unwanted software or downloading malicious files. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, further indicates a malicious workflow. The ML classifier and ClamAV detection strongly support its classification as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=all+green+screen+apk PDF link annotation
    • http://chia4kids.ru/ckfinder/userfiles/files/levarebiwozokavarojuj.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8fff3e2a---28466772836.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/bawodopafifurugiv.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/fibanuravo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb1676636d1a26bc482b7e22cfc446a7/zurimuwugogemoxe.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/gakakoxameredarufutovim.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/rejiserab.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/6159065113.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/89361139444.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/xuzoxefep.pdfIn PDF document text
    • https://slide-bearing.com/d/files/19807028576.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/22377503512.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/pexukato.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/44137805112.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/78005504568.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/e78e95f8b6b071b392295f9c3efc115d/61196636645.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/62701046841.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/97067446468.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161387db386fe8---jivomilobudaxedes.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161408182aa54a---74362452305.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/gejelosigosimevid.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/jaribakerikopasaxizeziw.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135573b36cb1---sanisexo.pdfIn PDF document text
    • http://norilsk.torbay.ru/images/uploads/file/63281449831.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_off0000db10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 18732 bytes
SHA-256: 0efe38889c73ed204e42a0926f5138ddd323ecbc1c68ab55555de5dc28632ff9
font_02_sfnt_off0001247f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247F 10312 bytes
SHA-256: b1a963f12fede463c808ecb06dce578103c6427f916f9b7044c9eec6e62690df

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