Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd3be20fe67b15c…

MALICIOUS

PDF

84.6 KB Created: 2021-07-14 01:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 57b128029f5614772c18688ed71c0eea SHA-1: 6106e39cc70e26385b6e9a9b267ad520f818353f SHA-256: 4cd3be20fe67b15c41bfabb829027b2c723bb26a5639e3eaa4c645e9e46855bc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, but the presence of numerous external links indicates a malicious intent to redirect the user to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160720b50b5648---xofuvapabi.pdf In PDF document text
    • http://mictrogiang.com/userfiles/files/69361421151.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/9535243165.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/dasilumawuxilubelibopadav.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/q43vuvb4mg327bdta7l3ajh9u7/vevudonilirabusobeniku.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/4cf72d8773ba81aa16ef6d6995238000/bexagibelixumo.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ee06c1d0d15---83903414353.pdfIn PDF document text
    • https://ekransamara.ru/files/2320436964.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/c07b5647a8a12586c5299496b64adc68/68581038848.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/7d730p4hin26qll686b6gh2351/jizujesezojuzufatunile.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160706fa053467---getujilififiwofinosos.pdfIn PDF document text
    • http://olympusflights.com/files/files/ladap.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82f5a759a---gekegexusuvajuw.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f523e483ef93949bffc11af4a4a78cfc/movezez.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/44597707544.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/61949029827.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210625_1BC54E501DCC1A47.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8471e9c46---zudoguziferakakigovus.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ed98fa7c24a7e8fa25b17342b9904ed9/bulirasad.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c6a4385e2---fagokav.pdfIn PDF document text
    • http://yocarbroker.com/upload/ckfinder/files/33072409473.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/56973f26592bc70879da7c7424ef8e2d/ganajozuvegogakagezubadop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=top+rated+slot+gamesPDF 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_off0000e806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE806 10504 bytes
SHA-256: 1f0083c20a2ad72789aed87c522a7c78fdf971e94746a95b9362f3f2a33ce52b
font_01_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 16988 bytes
SHA-256: 1538172808a569c40e96029d48240b514b5b52b8cab6723b4af268b43f392ea0
font_02_sfnt_off00012c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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