Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4ccebd9f30f256…

MALICIOUS

PDF

82.5 KB Created: 2021-06-28 19:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0bd5e1ee95c32458b60a457b46381f89 SHA-1: d69d241bc334e2be309d01590a2ebf6e4c200a52 SHA-256: 0d4ccebd9f30f25647a811652258fcc0d384dfb86c73df22a092396d767d489f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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 https://koratspring.com/upload/file/bufagiwugusubewudunu.pdf In PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e86f9cdf95616cd416ee56bec9511073/99458032660.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6eecac560---gifuwokakogunigoketevanu.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/40184146534.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/woloner.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d77b7b5da62---jodekax.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b61d5b6d30b33bf59d0a9b427fa03962/wiluku.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/39892933799.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/5cf0ccad60f8b16928cf134fc59090fb/suxesuxig.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/40038714836.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b75bb3f3d54acf46d8f4ca568481eb68/roduludexorebimonumabu.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/41085924886.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16088790271571---gujipufafopexerenerotupus.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8ab0c83a0---junokafusupimofibisutowo.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/90754541673.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/72390333967.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b40e04df260---99828290667.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/b04a5fcbdb0f2f6e2246ee2e567cc72d/21912549659.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdc7d1c39e---89626741818.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/p5l9u9c7b50m76k7c1f9no9lm3/79949773662.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2732a4ae8e---pusamopez.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/74668519765.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/6436786693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=alliteration+for+forestPDF 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_off0000e752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE752 15188 bytes
SHA-256: 965300ec84019ec25291e1329509462e5ba2bb8f0787e9daaabff855efe6c166
font_01_sfnt_off00010ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 10188 bytes
SHA-256: 7447c5771e50556fd1adb15338eb32dcf7204477451cc93c48f66047c28ae7e1
font_02_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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