Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd54e33a0bb9789…

MALICIOUS

PDF

85.7 KB Created: 2021-09-15 19:05:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1093f92def2e0600af58737613c08eea SHA-1: a3f92c4d8bdbd3be862363fa433f0343c29ba482 SHA-256: 5dd54e33a0bb9789032d273ae877141d93d17ee2d6e6bcc7715701fa5e29de92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. Heuristics indicate this is a link farm designed to redirect users, with one URL specifically mentioning 'android backup contacts to pc' as a lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=android+backup+contacts+to+pc PDF link annotation
    • http://packturf.fr/files/gidik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f2e4f382---jadosav.pdfIn PDF document text
    • https://gencatakan.com/upload/file/55691896260.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/50198375660.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/motozuloluganewixur.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/28336190832.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/tasojunixuwesefinoxadul.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/varesogesebilupimuk.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/tumimobijonabezojekasiv.pdfIn PDF document text
    • http://krupongs.com/images/file/89454634437.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/51534037489.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/64112048735.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fopcc8jclqjrra4l7ufb0u85h1/87520341119.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/70418523590.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161354bc71f995---3404038986.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161382ea45ce0c---togodan.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/3031677369.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091223512480.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/93491806957.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109110004532228.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_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10499 10644 bytes
SHA-256: b1680fa7fb8a894a8c72732f58be95aa6e0a73a80cf8f364966f965a5b03db67
font_02_sfnt_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 17400 bytes
SHA-256: 2cf86efb324cbfc41b0c558fe3156e4ebc7e94483b932e0f0cdd3588dade626c