Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba618f7677136e86…

MALICIOUS

PDF

88.8 KB Created: 2021-07-15 15:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51d9905f662a16b89ba8c22ea2fb0f86 SHA-1: 06bd0b63b5f44468aa2a45f4d8d7d8b2339978b0 SHA-256: ba618f7677136e86610aaf95bdd46cbdad7a0eeb8fa141d605d05de0c151dd0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised CMS upload directories. This suggests a phishing or redirection scheme designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://mobydick-band.de/fckdata/file/43329669957.pdf
    • http://applecentervn.com/uploads/image/files/16908270786.pdf
    • http://cafehinglung.com/uploads/files/25565152080.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c196a09cfd4---22517430803.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c46bfeb541b---80191627686.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6addfb11---texejimefa.pdf
    • http://seoulsquare.com/userfiles/file/japakixenefuvebu.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/8suf2i7eindnedej2lg1f9detp/3403436264.pdf
    • http://mulroyenvironmental.ie/userfiles/file/21467808307.pdf
    • http://iaestedresden.de/userfiles/file/sesuvupevu.pdf
    • http://school19-zav.ru/userfiles/file/pojuji.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ef221f743eea632997d65199fe207ea0/72730935292.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef173865f2---tufutuwajatiwak.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4595638704---5140140068.pdf
    • http://alimentosldm.com/userfiles/file/84346713781.pdf
    • https://amd-export.com/site/upload/file/72112183920.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160df2dfa0589a---mijubiritawobozonoririda.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705ebdec2ad---fupatevabifuwiweworo.pdf
    • https://nepalimodelagency.com/userfiles/file/96126696526.pdf
    • https://petikdaun.com/contents//files/jerozikigavanexavupa.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf059e5d08---361877772.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9d68472489f6fdc125c6627d13289a6d/54097596551.pdf
    • http://csc0851.com/userfiles/file/20210623033325_8vtutb.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=tibet+book+of+the+dead+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_off0000fb41.bin
cfddfdb45dad49b7db71ab0e8d3fadb3c16824a580091ed293e9238785edae24
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB41 10372 bytes
font_01_sfnt_off0001129c.bin
de205b7983d29abc4149d4ae2022e0633949e1af3a7783685d04ea22c77a984f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1129C 17272 bytes
font_02_sfnt_off00013e26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E26 16792 bytes