Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6aa583f092f8011…

MALICIOUS

PDF

78.7 KB Created: 2021-09-02 18:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8effbce69f3d46587382dde139a2820f SHA-1: 12de518f72d0925cfd05c63390daad1d04504273 SHA-256: b6aa583f092f8011a01ca5e6e7bb000889a6f28bc17412244cdb3b10c3658782
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms points to an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sportschoolindex.nl/images/uploads/mezifalibiwo.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd0e29b716---92371461908.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/giguxawo.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/94949377178.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/bojufafuzifal.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160730e881fc6f---24418263534.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609033d20f75c---24955667727.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/74af2ba096783efc78cb4a24f5f5eda2/49014783637.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb2114eec---88975732156.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/88514568889.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/zizaf.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/153082291560ff03666aab6.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e374ad9441---48233054321.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021072217250130.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609e02bdd0804---delazekol.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac74a09ec---18516477465.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/dafogim.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/43100102233.pdfIn PDF document text
    • http://nwmanagement.ru/generic/uploaded/file/nugijotilanof.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/52912551006.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/5431182405.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/38324554734.pdfIn PDF document text
    • https://actor-conseil.com/files/file/zukajese.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=memorama+del+cuerpo+humano+para+imprimir+pdfPDF 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_off0000cb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB40 10712 bytes
SHA-256: bb392c60207ff927c8af06ed9a9f15a30fe7182d6a71501ecf1b3898beaf1ea4
font_01_sfnt_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 18740 bytes
SHA-256: 17e8e8d6341b988b8fd79c4411cc2e695bc40c22155f37c885690436675cfa34
font_02_sfnt_off00011337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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