Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a5ad3234b7351f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 11:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 39e7851fef9e10f86015fbfe1eacb5df SHA-1: 257c89f60fa427d946321a663274c9f7c369dde4 SHA-256: 95a5ad3234b7351f5d7634ffd19ba82da54f46032211955d986fae01772e8e6b
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm. This pattern is often used to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ikansambel.com/contents/files/26182644005.pdf In PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef20a7fc2---falazuwefazataf.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613278c908e42---85388494622.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/32046892530.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613947d0dca2a---51149340405.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/budex.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/gibugerivovemexer.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/vidatirerusokup.pdfIn PDF document text
    • http://winso.tw/userfiles/file/21307985591.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b35208e55---vuzakosixupigegenisoz.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fe88e4dbb7ad8b591493108ba156cc77/61625697002.pdfIn PDF document text
    • https://ijp2.com/contents/files/56755224952.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/24140215455.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/luposazin.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/57027356975.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/gigilojugexulonuliwize.pdfIn PDF document text
    • https://kimcert.com/E/file/67436029915.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/97111586476.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/rujoval.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/tukirovovuwiwal.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/11698601662.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109031014573325.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/xigojewexezolusuduzewiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pokemon+monster+legendsPDF 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_off0000d506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 19132 bytes
SHA-256: ed98c8f0c9c968dd5afc33f8d4a40fe018b2330046223069c0db583c6a66e1c8
font_02_sfnt_off00011e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E71 10432 bytes
SHA-256: b7afd8f23e85fb46ea67a6194c99581b118a48dbf126bbae642e2ca4e2969e67