Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f7b874f84d1c10…

MALICIOUS

PDF

105.4 KB Created: 2021-07-26 08:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 619a0ccdd487a6b9de780dbe3c4cbaa1 SHA-1: ca7b35323383908e97db68cfdc20fe6bf8f26a76 SHA-256: a1f7b874f84d1c108d72d5ac5e11ec1cf63b2757be9a4cf30425757bffa707d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it may embed or lead to JavaScript execution for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecb20b57a9---lemekibijajemivazox.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b267916cdb0---17589039074.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2f0be5d0aeeae4cb7b356af6037dff47/14594711898.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/jubusuzo.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/ebbfd0421000f474d1b589b2bdfa3d4b/xivixamoderomav.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/wepudilibenifezisawefuf.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/sclpi0bb48p91p4g927puap4v5/27042328762.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/4634d94d8171d24a803ddaeeafb24bd1/74242873720.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/859fb2274a919d1cb916e9276c723e7f/78549337049.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/idd6brne4q80apa8mj3l0ojtgt/64064296099.pdfIn PDF document text
    • http://come2menorca.com/images/file/wawifozorev.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210608015927.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608013777147e---39193855607.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/25246967787.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cae11b4ccdfd54c20906521e5b63da4c/8818602044.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/22363991784.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1a8796dfc---wevatezawifofulajigatu.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/56820370323.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/betamuzifefox.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d118d1bf79---80387378886.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2a20881c1---fudasakivire.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/dumakixafijifunubanivil.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/39364413259.pdfIn PDF document text
    • http://nakatka.com/files/file/74892232540.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/buditagowanezaze.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6595588d5---muriweni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=metodologia+de+la+investigacion+sexta+edicion+citaPDF 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_off0001320a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320A 10608 bytes
SHA-256: c1d44745819b581d554fa0b1a5dc5823cd360941e49f5e76a2489fdc72ce76cd
font_01_sfnt_off00014a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A3E 20104 bytes
SHA-256: 150dd5098560be1447e65c1bb96409c5647825a445b08b014bbec2ade8a9b969
font_02_sfnt_off00017c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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