Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b0759118e3fbb1…

MALICIOUS

PDF

85.8 KB Created: 2021-09-14 01:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3323b90de061cff9914b6888d59b41f3 SHA-1: f8a0b29fb8502420105d384d5a28437f1c399127 SHA-256: 56b0759118e3fbb1beaf867a705b4a9a9724335a60af4c170aaf7f8c09b306af
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL distribution are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://es-manzokudou.com/yamituki-n/uploads/files/5819210526.pdf In PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/98288274874.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/wigupememegivetileditik.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/62275357029.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/nopexe.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/163071913755209409424.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f857db797---jegutijimesaxi.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab8e0464d---rijuxusukikizagedonizur.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/73582222011.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/a5516be6225e8fde02d88899d2e15785/gabogagikabezewazepewi.pdfIn PDF document text
    • http://elma1.ru/!upload/files/30298441244.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/99153866280.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f54375e160---gevobu.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/c76046210912b4641c6b36d7a681c87d/25278974488.pdfIn PDF document text
    • http://carbontuning.ru/file/puwisenalemerok.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/fexisuzemumuxor.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/39158998674.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/rironifaxibaruvumifowe.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/fiwopu.pdfIn PDF document text
    • https://pcetravel.com/files/file/90686672656.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/wurosafadiza.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f908cfc4f1838e7695e17dd23c422ba0/25183784682.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/74514577436.pdfIn PDF document text
    • http://iltorg.ru/upload/file/bevez.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613588328093c---36481523190.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=new+samsung+galaxy+phones+2014PDF 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_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 18968 bytes
SHA-256: 6589ac4d5ecafb45b2dcfe7f8028e1d2ddbd065df155dbc340914b1a07edcb95
font_01_sfnt_off00011599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11599 11160 bytes
SHA-256: 73b547e3cbc14403924c04591cf70ab49ac43b9705d5bd23c95a09ade638f70e
font_02_sfnt_off00012fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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