Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfce656ecb220e09…

MALICIOUS

PDF

86.0 KB Created: 2021-08-17 05:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46795cb9f8f96dfb29b2351ba24892bc SHA-1: b6e82e6cfc9036098cf80d49030a6c2680f03e2b SHA-256: dfce656ecb220e094b658a891a1982d04c0c6b7fc555734a9ba3bc7911bc82d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. This suggests the PDF is designed as a lure, likely to redirect users to malicious sites or download further payloads, aligning with phishing and exploitation tactics. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • 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://nepodoshlo.kz/ckfinder/userfiles/files/nemedubetafefa.pdf In PDF document text
    • https://advance-pack.com/editor_upload/file/58932058160.pdfIn PDF document text
    • https://pindimana.in/uploads/file/35219814033.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/dejiluparusukul.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/dexujigorujiduwov.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/nebin.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab752dc49ef---ketawo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810720781f4---kajijemuf.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff1d79c674---62058207920.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607841ec493be---89168677174.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/wupomenunezotalugojexi.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160744c56eb6d4---zoxibudefitovigilano.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/foriwaf.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/6no6mga5rm3pm4qf7o47kbl4o1/49404450878.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea59c56890---gulugupazisivag.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/10946958032.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/48125889992.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/jijanemuposudulimunavud.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808b2bd96e8---97128152624.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609d42c0788b0---81366612276.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607a461135111---bapokanolusufuruliwukimej.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/xevatiji.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/9350790071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=legend+of+zelda+four+swords+adventures+multiplayerPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/85956093645.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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 11224 bytes
SHA-256: a5d6a28bb816c5c043180aa184624bde3dcc6badade1b72ca0d82a6e1b697296
font_02_sfnt_off00011e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E80 16104 bytes
SHA-256: 044001649eedbe912a4732a8972ff5e19be2bfd7522a85386b558ebae8e9c303

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