Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d14b7d420c8eb7…

MALICIOUS

PDF

85.0 KB Created: 2021-09-15 23:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4ae34c08447319bcda8293d6087c469 SHA-1: 254527f52f87e65554b00ed445a7fbeb74e5f328 SHA-256: a6d14b7d420c8eb702ae39bc3c74ff0ab29550d77f74882099f4c52e7fe19fbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF itself appears to be a lure, possibly for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=the+rover+by+aphra+behn+pdf PDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c21802cf9c---42157014361.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/54959239120.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/wefipi.pdfIn PDF document text
    • http://mega.kz/media/upload/files/38098936591.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/77776997798.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/5945834248.pdfIn PDF document text
    • http://master-br.ru/img/file/pevoso.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/fasekololuw.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/965db7156cabc84db4e4665c958dc0fd/25263216520.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/83278970396.pdfIn PDF document text
    • https://noventa.cz/media/files/file/46421622323.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/jupelemitoja.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210912033100_MTE3Mjg2NzUyOTE=.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/72c86aea0d1a894bec193888c9e83a45/rimore.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130281846be4---jatezalegezimo.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/57008877902.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-16/20210916040538697653.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/42276202400.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/pofijikaronapa.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133c51f9e250---35104801064.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/90085935810.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_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 18368 bytes
SHA-256: 44f909d68ccf428254b5ef8da08c16c189a9655f0a14bdaae1a147c1132777cf
font_01_sfnt_off000116e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E1 10472 bytes
SHA-256: 87a4572eb0760ce7956eb64b85571cf915e27d7a10bad340bb820cc8c59b3d47
font_02_sfnt_off00012e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1