Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b5394aff88899c…

MALICIOUS

PDF

73.8 KB Created: 2021-07-04 19:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4c8e9e179e956093185feeb2a8ff5dfe SHA-1: e6fbb23ebd019e29c03f93d77aff720219bdf97e SHA-256: 21b5394aff88899c099dcbccbf77b775c7f03c5dfe02a4d5a9c84d87df669794
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm hosted on compromised CMS uploads, suggesting it's used to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm nature are common in phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d554d1be5a---21711699928.pdf In PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2b8c6d221---94390138832.pdfIn PDF document text
    • https://angkalaris.com/contents//files/lolaxozafivowedijife.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/77868893981.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62456401f---54138073111.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6598d08560---24786061113.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5fb89492---71615874446.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/8e78bb1bec31ca8e3ff3373de696732a/rivekabojotubobuno.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/10657303870.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160820171c040e---ropazoxibidejufanuwopar.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085314aaa493---nelijokowiziwokukowogev.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703f477c901---19359670409.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/40a837de857bb2e55cd539200a610b8f/96746539242.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d961dcbe1c---78947252622.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/zixetodatoveforedigapala.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c0e0fc9e2d89d38d4bb0dec2c593b0ac/77033162272.pdfIn PDF document text
    • http://shsclassof1970.org/clients/872719/File/46969307389.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/eo7oaamvdciicaaemm5bchesd4/74518554395.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/zojesijoduf.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e96a2f426---gonurakav.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820002ea7c9---22331173471.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91b2f26300---bogukoxezikofomuroda.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/segotutur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=best+way+to+watch+the+marvel+moviesPDF 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_off0000be82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE82 10708 bytes
SHA-256: b4092a3ce55c47b065b8a844b49d9a00c31fac6ee4f8f08a67723398a2a4e611
font_01_sfnt_off0000d735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD735 16392 bytes
SHA-256: ab0350121a5d810663ccf60c033567ea33b7151f9377e5e7afb75c707bdd8d97
font_02_sfnt_off000101d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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