Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca43114550ddc253…

MALICIOUS

PDF

74.3 KB Created: 2021-09-16 09:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3474293ed5e41100c0b3434010f67921 SHA-1: 54992e2cde7e61e022b2bc6f72906ed2c91ccaf7 SHA-256: ca43114550ddc25339cb003e3be020dad70f03a39cf9119f025f9ecd32aa92b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories on various domains. Heuristics indicate this is a link farm, with a high ML score and ClamAV detection confirming malicious intent. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://jonme.net/ckupload/files/fesidorijajenuku.pdf In PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/0pdmqjlp3v2s335h95oqsomk17/sovofijapasixikibuxidus.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/d75aa2cc87172ae8d2fe97ffc5e11152/suganojepap.pdfIn PDF document text
    • https://estoniapools.com/contents/files/33408249917.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/10fb08a51a64a3d0ac45e3aaecdc6e21/16715345569.pdfIn PDF document text
    • https://magatek.com/documents/file/42627834951.pdfIn PDF document text
    • https://heyratacademy.ir/file/29077156298.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe2955254---xetajegoriris.pdfIn PDF document text
    • https://loyd.rs/images/file/26915450037.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/renejorozijejijolomo.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/43416765393.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/vaxesadepizudalizejun.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/zowefomexerobe.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/52444003837.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/vibomufilotana.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffa1a27842---58282879423.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/91414660887.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/tawufowa.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/rojadetodajo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/he9sr0inikpoe60sgjrd7jgr2e/803584353.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/84464856995.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/lifoguvinaluku.pdfIn PDF document text
    • http://polkovnik.su/upload/file/dijivulajames.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+parasympathetic+divisionPDF 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_off0000c250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 10876 bytes
SHA-256: e42c7077461bca7782f270fa482e04cad18732885a23af49d269cb64269f11ac
font_02_sfnt_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 15816 bytes
SHA-256: 6b8f4093131eee364b68eae2c6bcbf4a7e6322066266d46b0b5aa72904c23477

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