Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef044524932c4c1f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-02 13:06:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4734979fb20416e09d940299cde484b7 SHA-1: ebd26490e89ae3390eb61cfeedba5b9d2c7e3318 SHA-256: ef044524932c4c1f8fbc611ed42fd03b35849e3975e3cfee9ae9654b3e34e2c6
204 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with high-confidence heuristics indicating it's a link farm pointing to compromised WordPress uploads and other disposable hosting. The embedded JavaScript is likely responsible for initiating the download or execution of a secondary payload from these URLs, contributing to the overall phishing and trojan delivery objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pctd9n0v751933agdc8eh9kgj1/renogaviturukepep.pdf In PDF document text
    • http://geredekombiservisi.com/userfiles/file/tasutemunukoladigufe.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bb4a608868---lipaxugurunexoxusazet.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/19466395813.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9269a90c2733638f23093460572097a2/pegumibe.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/gexowikarulafetesavafa.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/mafusitokavi.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/8327361955.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977e6926299---vakokebufalu.pdfIn PDF document text
    • http://greenberetrotcmedals.org/clients/e/ee/eef2f5edcbf7b69ea683240098563b39/File/3661952664.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/22811373246.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a001e77bc9---75539986245.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/fsjhaf4pr5f0g12dtq28sf0ij2/gedelapapaliwariw.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160838ad8b034d---95753097494.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/cv84qn9cne685rvdgh8l1tdk58/41989811293.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a6f8f7936d566a18ff63661ff50de677/97690307022.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/42030977969.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/33397203305.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/wowisu.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/10fef78e1b4a22d721490750e8e5cc9e/rapudorogojefulapa.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/kedidurefemiziwigigetuj.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/xumogamefebuj.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/22383562007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=auditing+assurance+services+and+ethics+in+australia+9th+edition+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738c0616ceb---xugokujurewitedow.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_off0000d4f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 11212 bytes
SHA-256: 430ea6f32571f66e90a6028080d345cc12829a19c29458225891e72db2bf2982
font_02_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 18388 bytes
SHA-256: 3e18db7cdff9a3ec688782cc86f5b477088454dbef2452fb5aaf51293c4e1536

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