Malicious PDF — malware analysis report

Static analysis result for SHA-256 c49862b90beeb832…

MALICIOUS

PDF

83.7 KB Created: 2021-06-25 23:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0fa6bea8971c383934d761214e5326f6 SHA-1: 0f8220e33bb1748e92e226d619addf6faa710c06 SHA-256: c49862b90beeb83296dfb390fa834a34147034cd60e943bb94e83ed325c0a4cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://hrdiborice.cz/erucom1/files/files/46863601565.pdf
    • http://kayapaliinsaat.net/file/jiwajomosolasawunapazas.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/vnv869rtsesr41f1eaip7e6b1s/98614475084.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/j1jgnm1l2hqdu7ipclu2uvs1d4/68357351948.pdf
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/89269304954.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beaae620be3---wogevo.pdf
    • https://palcev.ru/userfiles/file/giwarasijeberafalexumu.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ecfe8ed7a---3018285506.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/38e96c42dc0ccc603a6f4b9dc26672f7/31559060276.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/2b04e00f7990e2679021b384e75b55fb/bipanatiz.pdf
    • http://thepokeluau.com/uploads/files/3982632714.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160968a8bf342b---81648777417.pdf
    • http://yves-segers.be/userfiles/files/fenoxolebavotiwolomolawek.pdf
    • https://clickkedai.com/userfiles/file/9536445844.pdf
    • http://chinocorporatechallenge.com/clients/6216/File/medusujurifo.pdf
    • https://alnahamgroup.com/userfiles/file/wupamuserasugegolafob.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a346c242f8---nazefazofikos.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/mojipukizawanewizuz.pdf
    • https://balajitutorial.com/admin/userfiles/file/89600307711.pdf
    • https://tavio.ru/files/file/refuwekixipin.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/shgcbo3uio63hc5t3gq1o6agl2/79941015556.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d4380f79a---15219663104.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=constitution+of+germany+in+english+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1e7.bin
7eb21cf0f18b37c1f1ee1877ca84a60be22c7d5386b64d2bf9a45353b419162d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 18056 bytes
font_01_sfnt_off00010fbc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBC 16792 bytes
font_02_sfnt_off000127d3.bin
6af41f96fde8ca5826760e9a7e3105fb421630cc0a4cbeacedaef6efeb26865b
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D3 11192 bytes