Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc04b6e94929b95b…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 05:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 591d5f2ef466d517fe53bf33cf8a2d8e SHA-1: 17e71e53e49bf133188cc01acfd49f119c3c00fe SHA-256: dc04b6e94929b95bf00c9844d0effd9e3afba9e3f8f7289e3a49942005fc7d49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised or disposable infrastructure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a deliberate attempt to create a network of redirect links. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/wevekufexutazimuzidosuko.pdf In PDF document text
    • http://ledseoul.com/userData/board/file/63341036759.pdfIn PDF document text
    • http://punaide.com/userfiles/files/xiralago.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/karevike.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/98999510773.pdfIn PDF document text
    • https://10fci.org/userfiles/file/31558960401.pdfIn PDF document text
    • https://birotex.rs/images/files/87481357990.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140e61148d58---52979258263.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/d806818bd3173efcb54e46977e9fa845/gazejafonidif.pdfIn PDF document text
    • https://gencatakan.com/upload/file/ritiponazavinofubofemok.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/24650841066.pdfIn PDF document text
    • http://videocycling.info/files/file/51920950099.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/67004006077.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614090e98befe---61926399571.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/rhvuu1m3i21tkeqa5rs6d9f3ms/jawuretexaz.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/98863621867.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/85520417927.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/61487256806.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/8868770933.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/fenidosisifexaxo.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vabemenagolorepotigozob.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/64866190422.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613921ec9e255---misafomurik.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/6464127360.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fallout+apk+androidPDF 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_off0000d993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD993 10256 bytes
SHA-256: 7963becd9a6d0d038af6039917bb9b5d56e35252ccb7ef2e65f62d09fe22c76e
font_01_sfnt_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 18408 bytes
SHA-256: 0dfc42b2d9972f32a74b2a70198e95219d8ca061103b15bf021642feb9c15960
font_02_sfnt_off000120bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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