Malicious PDF — malware analysis report

Static analysis result for SHA-256 377d486b2c84cef3…

MALICIOUS

PDF

71.0 KB Created: 2021-09-08 18:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab62a9ae3b52c3a3a99db1aa44c12181 SHA-1: 28a3cae8c73b1116534ecf9bb1d56f8bb22f8887 SHA-256: 377d486b2c84cef3aa370a7e61df530fe338390b43ae947fd5185a90237b2909
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, with several heuristics flagging it as a link farm on potentially compromised or disposable hosting. The primary attack pattern appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://syntra.pl/userfiles/file/32002279145.pdf
    • https://cincia.ro/ckfinder/userfiles/files/nujagoluwagoxuko.pdf
    • http://contelex.it/userfiles/files/44313965644.pdf
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/lelakavivopafivimumugerik.pdf
    • http://kukubara.com/zdjecia/file/36981072477.pdf
    • http://jrpst.pl/userfiles/file/37170788170.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb66b136e4---kolamifew.pdf
    • https://cet.sk/res/file/wopegavamufuziveminoxo.pdf
    • https://fontaine-eva.fr/userfiles/files/detabozirelekoxe.pdf
    • https://polaria.cz/images/file/nawuzetakowilonowidor.pdf
    • http://c-six.it/userfiles/files/11472964697.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161301bfcdb4db---76834187511.pdf
    • http://studiozammuner.eu/userfiles/files/75753171659.pdf
    • http://firesecurity.sk/userfiles/file/lakesunusew.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161319a2b419a6---jomaletudesazikazorixa.pdf
    • http://audidalys.lt/ckfinder/userfiles/files/tidididajodujumos.pdf
    • http://mawratanews.com/armedia/uploads/files/71475387706.pdf
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kifesimoxogutukagalogipuw.pdf
    • https://camphacement.vn/upload/files/varerulelotokadur.pdf
    • http://ck-buhgalter.ru/userfiles/file/pifosobizewoza.pdf
    • http://egitara.com/upfiles/files/negekolusol.pdf
    • http://himalayakebab.com/shipinc/userfiles/files/mopalezupidutozikug.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=marginal+utility+curve+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_off0000b798.bin
9e4564add099ca05d794c9378098f34308d6dcdcf9f223d6e7062f875d586b4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB798 15252 bytes
font_01_sfnt_off0000de21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE21 16792 bytes
font_02_sfnt_off0000f638.bin
8e4d542cee7d34d281a8b13b7c9d8899f047b3acf47c15ed77191dd36ddf1212		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 10780 bytes

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