Malicious PDF — malware analysis report

Static analysis result for SHA-256 328d09974cb793e6…

MALICIOUS

PDF

79.1 KB Created: 2021-07-16 16:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ecc19320399606bf3f657d08bbc560b7 SHA-1: 048c19e51ccb84e8ec50f9f89c32118aeaee3a1d SHA-256: 328d09974cb793e64547c8dfcf47f07e313bb7ca80693f12788dd44f27022244
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection for a phishing trojan. The file contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The presence of numerous unknown URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089308018672---goporigar.pdf In PDF document text
    • http://hintzfamilyreunion.com/clients/1/12/12a2788c5de59b93c87e4eff35998d4f/File/31706753422.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/63378207566.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee2ca792bb0---jafoz.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/xafuvekanutisaxegebesa.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06a991bd9---19461081384.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/xubawevatizeviloxutavadet.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d934ccbc45---banibavukiwapusenan.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/caj2471v61ppm9mapvlpaks690/54599637224.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/14f800fe83ae52f4bab44ef75df374b8/73271265783.pdfIn PDF document text
    • http://cloverdiamond.com/file/muwez.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/a95e92889358833c041b1963162d6aeb/96996040009.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/61973618579.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078c37fc489d---40624809457.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/cb8df7086f535e650f5c23fad1e2a873/televudemivaxomesinet.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/dusoz.pdfIn PDF document text
    • http://darec.sk/files/files/81929470975.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/72930862974.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/sugutijemonuwabemab.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/sujivezirekuz.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/mumumawaxim.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075375484bf3---jibodemazumopawijaso.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/733b39b6ee065f37ffbb1d058718d127/bijewipisugedibuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=you+and+i+has+or+havePDF 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_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 10352 bytes
SHA-256: 5f8e0d63918ed27d087659a14bbf792f3c6cad6721b41dd33cc11a039fd4d984
font_01_sfnt_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 17080 bytes
SHA-256: 121e35fbb25f6dd8383b80504d8205b0f3fcc044edcd4f01fcb83a4dbe699b5d
font_02_sfnt_off000115a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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