Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1614cfc4924c3bb…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 00:18:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f643dcb5514aebf9d6b1fa8e222eb824 SHA-1: f329d54914b1bc973eb787b178ffc143a41f3e0e SHA-256: e1614cfc4924c3bb9fb3adbdd3d0cbd8a22f30bd1b7d12bd1c63d148e6f0a406
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, with several pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://laborke.ru/uplcv?utm_term=pvz+2+free+shopping PDF link annotation
    • http://altaprecision.com/userfiles/file/10396748571.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/56836037840.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/67470088927.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/24839347930.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/15566620558.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/judobitojowef.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/mekomabimik.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/8093704406.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/27745023664.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/digofinegik.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/55d3690c922765930536da8c00be6010/piriga.pdfIn PDF document text
    • http://cochemical.com/upload/files/14747234357.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/95367780648.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/lgg2losh3qurmht8bvmqgi6d65/pulolukujanezutofak.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613946ab63361---fimodiniliwupok.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/rakufateweravataruru.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109170256291400.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/gebuve.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/3861115929.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b148ba09a---mejexomajimod.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/lelodosibisaruzogawu.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/pilugikivanokaviduxafixuz.pdfIn PDF document text
    • 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_off0000c1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D5 19088 bytes
SHA-256: 5849a0d2e86fc3ac9a3b5045f5c63b43e9b3beefd38a6b012a672608d3b0a887
font_01_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 10580 bytes
SHA-256: bc55d44e472d62d7148d007aed6feef3abcb18ecc3ef090755185661ccb58884
font_02_sfnt_off00010ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1