Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c44ec70cbb65b5…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 23:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97cbc24a21290e75ca88dbd9010d074a SHA-1: d1d3d636a550575a835dfe52403bc88853caedc7 SHA-256: d2c44ec70cbb65b530ae75138fb3a719673ec0f7e1a9363ada019ff425306314
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to distribute further malicious content or phish users. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614047b026590---wopupidajedufelivamalanox.pdf In PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/19405793556.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/xesajapaxuketenagalat.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614455e05d947---tevejozomajonasuvamorewe.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///48396700217.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/97222606630.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/sebijipufof.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/lozovezijoxopomu.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/462731952.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/65823456073.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134197c3d75f---tupupe.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///diminarizafawolaluk.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1631394269sodutewoledilelafon.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/dutopuxumukid.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/38443210203.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/xebafolevakowojeru.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/97915836849.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb556b2882---17428736239.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/32633730868.pdfIn PDF document text
    • https://dgssu.com/upfolder/e/files/20210902090129.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/39516649833.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/xedovugegutawenoxokat.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/mufaxubepezenotom.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/faletepebivodos.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/pujiw.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109172151286395.pdfIn PDF document text
    • http://hausdergesundheit.net/userfiles/files/49991661401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=watch+my+hero+academia+two+heroes+moviePDF 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_off0000beb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB6 16492 bytes
SHA-256: d25d9c0a31dfdfd07dcabb0c2bc4e19534c4ab96beaa616341877060aba86a76
font_01_sfnt_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 10744 bytes
SHA-256: 116313b73ca21e22dd18a9c686dd6f18503647de2542c6aa758040fa7a5f731d
font_02_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1