Malicious PDF — malware analysis report

Static analysis result for SHA-256 594de410d19f9293…

MALICIOUS

PDF

84.1 KB Created: 2021-07-17 07:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6a2119d93aad00e78746ebaa0165071 SHA-1: bae18af12c1d7f99bc69058c69fb2bce5bf164b3 SHA-256: 594de410d19f9293ed82653f76d330bb738fa1db8b2835f89a2297bd68629dbf
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, many of which host PDF files, suggesting a link farm designed to distribute malware. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to evade gateway security. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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 http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/406a48b97706763317e6c1db53b80c52/kukaxoros.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e7efa20b0---51053366592.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/terogojaxovigekupag.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/21f7720f16bfcf4a29141394c1540e6a/46274183141.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0d9e1c2f1---52018705522.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aab886cd070---jipirazinuperim.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/12338563918.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/a5442f296dd4c50561871ffc645d85ab/wogosuwotisumonelonibal.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/xabozorafilas.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/ruxurinozike.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/me6pjqhv51mmhiv6oak6qvn830/59767332506.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/wubetef.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///10765995071.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5c03ad57d---sabimenaxaditelupidika.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074089ce9fe4---81208065001.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/4b128cf80d31b59c0bc91b91fb2383e1/logovikebopuzunuvoki.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/85728435665.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210710150247.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/nesonodopo.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/82484319980.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ed3f5b356---palopig.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c1c53f955---85779277009.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/86443996849.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/tepabumu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74e5d9167---22870115617.pdfIn PDF document text
    • http://gdgom.com/upload/file/210614191415290851tonh19gk2zlg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gta+vice+city+stories+highly+compressed+10mb+ppssppPDF 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_off0000e0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 11392 bytes
SHA-256: 44fbb10cb3b7ed3d4db6a539bae9da06b685f99e626280089cdcfa2c6a7cd069
font_02_sfnt_off00011396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11396 17760 bytes
SHA-256: 86cdcfa4471d939ce15fc8e2f270320fa18c9a5c27aac54df3c887da9a95a669

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