Malicious PDF — malware analysis report

Static analysis result for SHA-256 371f28fbe3b61f5a…

MALICIOUS

PDF

84.3 KB Created: 2021-08-21 10:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 035a19ea607e853edc47478a1a8a7d6d SHA-1: 6fad0949b41ba9b20135a5505f64f51f86959d0f SHA-256: 371f28fbe3b61f5a4fe7251f1b9971c85be810aaae737aed55d7f2786affade3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm designed to trick users into downloading software, leveraging compromised WordPress sites and disposable hosting. The presence of embedded URIs and the overall structure suggest an attempt to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://allytemp.ru/uplcv?utm_term=download+coreldraw+x8+full+crack+64+bit+gigapurbalingga PDF link annotation
    • https://slide-bearing.com/d/files/2825700735.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/m8cfi8cckiicch7ihtk78krq17/zukizubifafekemobewepadax.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/sakonukodabigapurinotex.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/menawupiboripizavijibiked.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/210824572471.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/qogcqd2v3fhf3qguft2t93ocf1/45499671802.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bee60a57b---kumivenivifuzi.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/o0nab3mp2thfu1ln9jjl5t59lv/nelafudo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/7uou7og2gt5h9r3b5i6behskjk/11962768627.pdfIn PDF document text
    • http://sme1970reunion.com/clients/7/78/786f1e38e9ed540b4a7d4f5dbcc09398/File/41594717689.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9532bc41d6703247392109105bf3b5ca/13685037113.pdfIn PDF document text
    • http://siembra.me/uploads/files/ginijizex.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/nafefimevapigozubolagisut.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/1ceeit77fqndiotj0g81qs07f5/wanilujafunudodegij.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3af65fab4---kopowodusibav.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210724_111743.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab99640513e---71484798535.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/sisozadijomimugaxikawud.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210821065751.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/50159444455.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/21b1762464603a751bb011c1862dce18/vurotiwelixewi.pdfIn PDF document text
    • http://xsteelstock.com/d/files/buruxubujajatuzotu.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c2a9e97be---64115666136.pdfIn PDF document text
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/nozuwafuduregevilejepigi.pdfIn PDF document text
    • 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_off0000e14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF961 11604 bytes
SHA-256: 1955ec65a43914755797c79598833bacfc6530bf57f8cba963d9d635ee04acbd
font_02_sfnt_off000114c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 17604 bytes
SHA-256: 8f5859680c54a08ea759200da4f3dca1188d14f9ab792bc859026204bf199cd4

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