Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dbacb4f575af7a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-03 06:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9a8f58585bace5c9311804092fd6dd5 SHA-1: 112d8ef17755df0476e1dae6754895612262e28f SHA-256: 84dbacb4f575af7acf9fe3565a9c2c6180c1bc058a62c831cda282cb39619e9d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the link farm structure is a common tactic for initial compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://dgjst.com/upfile/file/12312583895.pdf In PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/62c28a354377704e5a5668adb28efb88/buzojazeraru.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/9321624528.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/vhi8fpagjqsn9hpbjedj1rr6i0/jezena.pdfIn PDF document text
    • https://gilbertems.com/videos/file/relakovowa.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/71548695980.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/nisuxi.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/gikujotorerozejip.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/dutaropezid.pdfIn PDF document text
    • http://smartcevent.com/clients/871459/File/kiwonemapusejudaxuxi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/161005e10a8dde---28673362795.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d4a70ae63---regetibawowipunilojotar.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ff6a97b32---69990928714.pdfIn PDF document text
    • http://thinhhoanggia.vn/Images_upload/files/lovijovowafepoxepevox.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/fekijotezamolalo.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/83284238055.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0bac78146---buwij.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/37306986017.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/savewuduzulemivo.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/32482702082.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/88098628259.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed0f9833db6---kazekudiluva.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/51778185576.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/3522261163.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5a1vlc0thk1fh8ogr6hg3iqoo2/majosofaropem.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/fezidepunukeke.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210824_151636.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=jateorhiza+palmata+pdfPDF 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_off0000e0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F4 18028 bytes
SHA-256: cacc46c3697adedb158eeff88332d20a73d0dbabd062d59e3f44268f7be4f813
font_01_sfnt_off00010fb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CD 10544 bytes
SHA-256: c2e7be5d2883421b50b99907552031bd971a3d2aab2c1e290e6bb4d7467807b9

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