Malicious PDF — malware analysis report

Static analysis result for SHA-256 3021ba1b1f0338a0…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 18:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 086cca1094eb756fd89300aebff28b95 SHA-1: 2657d103913d39b21f248275c150539779b810ae SHA-256: 3021ba1b1f0338a0a4e1ea17c61de6b627b9e7c534d29c458cebe893bc2ed73a
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

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://philabc.ru/uplcv?utm_term=star+wars+rpg+saga+edition+pdf PDF link annotation
    • https://damiel.eu/userfiles/file/jututumozedo.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/90709100029.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/filapugakefox.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/wuxuva.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/51944337926.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/82031971871.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/87450232209.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429fe11ab83---namiduvijavaxigujekozan.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/73719799700.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143866c68c0c---48233832650.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/sebidasakokikigukez.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/94379908219.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/mbr2ta2mjvaijtae16if3jv734/76924895029.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/tiruzamomiminivu.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/74166047979.pdfIn PDF document text
    • https://nasikampung.info/contents/files/61681884779.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/zelomupemupav.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/mujadipigisat.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210916235459_886298877.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kokovedi.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/41121904769.pdfIn PDF document text
    • https://spyboarcams.com/files/99361460661.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142fe843ccd4---30441024368.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/58804603910.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/tisax.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/fedepu.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_off0000cd41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD41 18588 bytes
SHA-256: 219c5d2ac855b14df1ebf3588aa48f4ab3e273f1be92d87338354b2dd7f498ea
font_01_sfnt_off0000fd9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 10788 bytes
SHA-256: 2c801bc09c5bf09e3b8a5fe576a4b600885595079638b0723cf57a502ac79e20