Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa77095795b8aced…

MALICIOUS

PDF

76.3 KB Created: 2021-07-27 12:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 7943df10d93a44a12ee79de953dfbbef SHA-1: bac5fa362da4fd1ce7545d613c5941108bc1c716 SHA-256: aa77095795b8acede0a353f0cf87eb6288a4e814968977a9161e370dc4fc8194
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/e03sddr2dmsl2u8g6r0nj81mtu/tisexoguwo.pdf In PDF document text
    • http://adas-muko.pl/photo/file/letaninasilelekezuzu.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/62137273154.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/98959983269.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/cbda8f391a34529cf460419118a69766/towebisevodarikimokemebux.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/1k5arrh4u56bl8324bha7vrb17/58293055389.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094970c38620---40524557684.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bnqhkot20kqee1gqsfutv3s235/46288185793.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7777c5ad4---50112554253.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/nemesigimo.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094e519ddbaf---garesazakewomufowa.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/51144291701.pdfIn PDF document text
    • https://carlojans.com/cms/file/julevosotusunisebumovowuk.pdfIn PDF document text
    • https://sanidom.pl/img/file/17801237056.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160858ade28f97---78317183303.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/kipukasawurogonar.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/5add42c4d8a4ca5ab187233027c68966/lukutolepanaxijirobex.pdfIn PDF document text
    • https://geya99.com/ckfinder/userfiles/files/vonujomer.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a26b30c35a5---pelit.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/junugak.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/d90ea02c78fa4a2fa85f117a35e18c64/mexaj.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/7e8a5673ce5ce93817d50f0667118dfc/8241951791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=high+speed+chase+in+middletown+ohioPDF 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_off0000c764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 10940 bytes
SHA-256: 83dc38fdd7b04ac857240528e7b40d6739bbbf88f9a538af91c59f9847ca9bd2
font_01_sfnt_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 16364 bytes
SHA-256: 558390e8a8f0d0c09f0186b9fed4aa2b0754737d66164343fef399a8da6fa661
font_02_sfnt_off00010ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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