Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c898c7c88b9090…

MALICIOUS

PDF

82.8 KB Created: 2021-09-15 15:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 425af100fc9e5a6bc01e8636d0bdf22d SHA-1: 05cf8c7294f878f6ef87082c94b43a0a6ee441b0 SHA-256: d4c898c7c88b90904348fe0e86ceea251f599c05b51f1311bd2a983c07aa0666
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct hosts, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://telek-trans.hu/editor_up/57680818035.pdf In PDF document text
    • http://circolonauticofavignana.it/userfiles/files/zunexubumumewajapuzadumet.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/kurafunul.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/d804efa1a00c9365ca950df5dceac51d/10311220069.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/sizuputivibajiwejidiliwaw.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/duled.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/7517326597.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/figekeloletedak.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bfe92f462---18246309287.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/9834374708.pdfIn PDF document text
    • https://premiersuli.hu/files/files/gitez.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/40328887710.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/vabefige.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/bepomajapudav.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/ragijumoripuwimapam.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/aaaa118610775d342f76390f9031943d/negunefugewade.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/leloxebu.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/dakisi.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109140030293850.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/jefefibupegonifipaxe.pdfIn PDF document text
    • http://nerezove-kuchyne.cz/UserFiles/File/52927664222.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/57958464204.pdfIn PDF document text
    • http://0048.pl/48files/file/sowesegofinu.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/sekerijegitefobusasiwume.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/2109030603424748725en6a.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+unlock+a+phone+using+a+laptopPDF 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_off0000ddb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB4 10824 bytes
SHA-256: bd7b9a7b46e9957923997c066cabd671cbbef17fc2fb39348ed4f8f011f20b50
font_01_sfnt_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 18088 bytes
SHA-256: 3a1b3f1823c3d397104010a2c73a657b412b395197f9cd1561e39c27ab2bd0e2
font_02_sfnt_off00012514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.