Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbaf17f8029a13cf…

MALICIOUS

PDF

72.6 KB Created: 2021-09-28 16:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f8d929c0470347d3a2bdba06e8a4280f SHA-1: 845aea06bbe5a0c8099eb67408e96bdbe0215e7c SHA-256: bbaf17f8029a13cf3d118000e2aeae7ad7b8f23d04b0438b7198ca0252f41e97
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous embedded URLs, many pointing to potentially malicious or unknown sites, supports the classification as a phishing or malicious content delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://galsabino.it/userfiles/files/wezapepuwitezonud.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613568f65804f---52524553341.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/nifebibeliluximizuguzel.pdfIn PDF document text
    • http://cascad-trans.ru/files/43942930810.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/wujifufirexara.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/danizeduvuziwon.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161525f94aa302---sojokiroji.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210911190525.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/97469757109.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/30854597570.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/97173363112.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090705044273499.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/suxisiligedom.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/vizefin.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/t8lg42mn568bq36sqkj4ufh9d5/24271751249.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/a883d3208be27037b74244ac1b210ee7/pumiramomegulokoterinorar.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/gedulijonamilanubadani.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d8dd29d524---87344953463.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/fuxodorazoderanapofikeg.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/jijopufaxeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+limit+internet+speed+on+android+without+rootPDF 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_off0000b500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB500 18036 bytes
SHA-256: 76cea7e6279cf932f1e468bfb26d669a847733acddd11e94aa35f352510cd608
font_01_sfnt_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 10836 bytes
SHA-256: be1b6579a7ad13db0870162e72395aeaa6866dee873eee1a0f68eed7bfa9854c
font_02_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1