Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd53936b0a01ae0…

MALICIOUS

PDF

93.3 KB Created: 2021-07-19 21:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 714fa16c6dc98f3970cbf796cf3ae61f SHA-1: 6e96d803a63bc5d1467c1f0dcd88530720bf58a4 SHA-256: fcd53936b0a01ae022ebf987982ca0a2fed9706c662e3d98e33b439f1b2db96f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs, many hosted on compromised CMS upload directories, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this document is designed to lure users into clicking on external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/pimite.pdf In PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc30c8360e6---13199840189.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf1db5b02e33592c3d6f2da306210e44/45857721848.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/soroboj.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/bddb8af93926dce5f9487e0285f55cdc/55493873340.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/98427173172.pdfIn PDF document text
    • http://ca1970.com/clients/10044/File/36648660933.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609477aecb816---99640766968.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4f222e3db---kopodemutanapavorokipawim.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ir5abqu0biaqprkmohebbn7jn3/kumazarujajo.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906401a1ada---6062636466.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/33216563967.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858dd0ebf0a---pegiwabog.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8b7d48608---buzud.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/defojurot.pdfIn PDF document text
    • http://kbchina.de/upload/80254185910.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb324998e7---zovowawejeb.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794cdcd15cc---tolujupovubatumisumezine.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/f62783950529a54c92028d5ce540d1ce/77805983446.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/rozutafap.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/bht8mucrmmvh8l0736qpt67fm5/barusumepikojifinapimi.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/zumabowu.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/vatenaradesuver.pdfIn PDF document text
    • http://candientuvibra.com/images/file/desukamoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=clothes+2+collect+charityPDF 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_off000109fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 10488 bytes
SHA-256: 74fb54c4002d5bf71e95e38af388b2743d233eac9517ae92016ee14e60c96e23
font_02_sfnt_off00013a30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A30 17624 bytes
SHA-256: 9e065f8a59d54d502b8463730e03c8970d76fbfd66afa4b3afd693329db7ab61

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