Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed753f43c50ebd5…

MALICIOUS

PDF

75.0 KB Created: 2021-07-23 17:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 07ea4a1b45c86a8ae803de839663eb58 SHA-1: 5c0877d9474bcddf999e8320665b73d4434b056f SHA-256: 2ed753f43c50ebd5f5eb18234edaf7bf467c7a863acb0eb0becc89241780ed77
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://szentdorottyapatika.hu/files/95924885533.pdf In PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///xarewejabosi.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1623596462.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160854bcd52b55---76071544847.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092b9cc5048b---gesokelorovobel.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93f8744395---lisefivoxonigojadopom.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/70752411088.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16081c503c1c9f---1514955811.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/16242565272.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/79493668995.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/guwira.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/bcbd3ecd389915c72da6cb110085129c/53927821358.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/borenosuzaxokazowuvabi.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/89095364552.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae62d1d0c0---zulixilutepal.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/67952903846.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/livuwo.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/63532603530.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/nivokujowokirol.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e42e0ea8c---62265403354.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785162bafea---vatilipekokagajanava.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s5f1efoqqlva5peoovcetrg7s2/24508657330.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=respuestas+libro+de+matematicas+secundaria+primer+gradoPDF 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_off0000bfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEC 16408 bytes
SHA-256: a230b4152e66c37912b04d00fdabf7579d9cbdd2df9c1e189db5c765f2c6c2cb
font_01_sfnt_off0000e951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE951 11140 bytes
SHA-256: 0c75830e83d6e55c561eac75a2be10f88b4ec58218d196ddf741d0bb6eb61011
font_02_sfnt_off000102ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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