Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a442bfde0c820a7…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 03:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c6026d917496d04fe16aac74e9ed1fe3 SHA-1: e4e69161cd3d3652017f04850fa92b7829f9f64a SHA-256: 9a442bfde0c820a7c4dbdb70d5234ba59700fc100680385e0ac3509dd38e2b44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm hosted on potentially disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a strategy to obscure the true destination by using many distinct hosts. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://gpmpoolandspa.com/ckfinder/userfiles/files/59144742240.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce06153d61c---pajozuwopikamono.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/93558292344.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b03d4ad8924---xoweriliwoderifugal.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/luwakawowiputekolenuv.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/sekelesaxifegiropudine.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/voledepinogofagafipunewan.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/xuwalixozutijidulujar.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/11686058927.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c1105de4ab7d6f1ac6a921897847a0c6/naniwexirugaliriloxowesej.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c332d199900---fagulataragugimu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4d7e7bff4---favugopirafutogazus.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6f31aa952e408c6aa4a160b9a54cf6b5/78523882278.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/khfp9oc5doabdaisjcos9j1m35/54099561211.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a6286d913---latuwisuzusilifijefad.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210624_194738.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c2ace88cef33f1e8a94ddebb446315fb/75584659024.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/rabenagizisuvuxajigunesi.pdfIn PDF document text
    • http://geose.ru/userfiles/file/74228261027.pdfIn PDF document text
    • http://standdominica.org/files/files/kidiw.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/8o9tkni9geoote4kemlrf70b1l/nevorimofad.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///pejej.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210813215952_cug8lw.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/44083842227.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/23501700924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=telecharger+les+journaux+algeriens+d%27aujourd%27hui+en+pdfPDF 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_off0000cf73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF73 21376 bytes
SHA-256: 23c6993244f3349de2efc3f17c0bcd29338bfdba18231494e9e92c2592443d5b
font_01_sfnt_off0001058d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058D 11128 bytes
SHA-256: 6e196e93506248f2e218921a8ff56fd8927085c28071b43c1c5340908b94343b
font_02_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.