Malicious PDF — malware analysis report

Static analysis result for SHA-256 882bfe98c3ad1940…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 05:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a38aaf3f702501faf357c9ebcbeef0bf SHA-1: 2668a616b92605248ca65f0daf7370d2c79a6348 SHA-256: 882bfe98c3ad1940631e042907b42d9d08e3cc9695fd56cf18d0681aca18f2d2
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to solicit sensitive recovery information from the user. Multiple heuristics related to PDF link farms and embedded URLs suggest a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the presence of PDF-specific heuristics and embedded URLs points towards a social engineering attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607392a4b064b---66747463505.pdf In PDF document text
    • https://hagakure.by/upload/editor/files/lipipigafodidab.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/lepamikisebulagupe.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/dadagomopivedoradinidaw.pdfIn PDF document text
    • https://patc.fr/imagesfile/3320670402.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/tugovogozofitomezepes.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/siwipumawojupijufesufom.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f89dd159e63ad332784a1a931b122dd7/72624947356.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bedd2e06353---90234676234.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1b7ea526---68745386073.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/4289141712.pdfIn PDF document text
    • http://zatacorp.com/upload/files/56436789464.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/pewaxarinaxabewebolaso.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/4946006149.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/vimizib.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/10084409499.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/bovesekuvem.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/18638001104.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/gonalotudotapakutixamabow.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/94904503115.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce67c7264---povije.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/disurezunur.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/28768676049.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=safari+download+pdf+iosPDF link annotation
    • 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_off0000d69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eeb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB4 10424 bytes
SHA-256: cf0fc53ad6fd1f2693f774254333feb793540b8ae04ad94ce4bb5fee7bbdfba3
font_02_sfnt_off0001065f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 17448 bytes
SHA-256: 69b1e2a2d620701e8ccde95076c3e232d28e8c2a0a3fe3d2e4668aa8f9488f92

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