Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a545cbc6a7c3ac3…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 05:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 42101aeeeae7549d53891c8412a56575 SHA-1: ab34c57b29f34e132636b3c13b9497f977a7f6c5 SHA-256: 0a545cbc6a7c3ac36c25db4bd78af704ba9434b37fd96fd5678431dd525bbf61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/cf0feb878928e1eb7105d0128228f21d/zasuditibopi.pdf In PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614661366b141---33527651807.pdfIn PDF document text
    • http://pileki.com/imgup/file/43026878978.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092303310126.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/42497800830.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/25088851880.pdfIn PDF document text
    • http://rnralpha.cz/res/file/2798218701.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/22175956790.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/galovuriwijanono.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210925133435.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/bimoteguposom.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109070606471146.pdfIn PDF document text
    • http://besteva.com/upload/files/23278800355.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/43648982497.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/43607837983.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/najewenago.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/78d575fde73d40285f78d9043208c6e3/voxupobulabagiw.pdfIn PDF document text
    • https://produccion.formacion2puntocero.com/ckfinder/userfiles/files/21623953111.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/lezafawijexuxed.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/71e31e853f26925976ff9e9cfaa01c6e/3993571853.pdfIn PDF document text
    • http://unsersohn.com/images/file/molejuzobabali.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/kikowe.pdfIn PDF document text
    • http://webbuilders.com/files/file/poxofujijebawigiwaji.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/8d9559e53a4d4d199e05d7d4383f6505/33130360340.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/96362183072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=internet+cafe+simulator+mod+unlimited+moneyPDF 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_off0000b4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE1 16088 bytes
SHA-256: 284dfb6462a2ba50b0f11cbae8d3a344183bf0936f1f04689124a3baa45a309b
font_02_sfnt_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 10804 bytes
SHA-256: d51f84c2d84556d838afc69c44d23e437400f58d4aefab4baa1be3e924f994c0

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