Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fab578e0514971b…

MALICIOUS

PDF

78.6 KB Created: 2021-07-04 19:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9020970603d675209241ce83e97c5106 SHA-1: d1f0035b9268aee21e9a54fe37bb539df75dbc0e SHA-256: 4fab578e0514971bb8b1308cd5a15997d4d58e306732a3855d27334c064376bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, with numerous distinct hosts and disposable domains, suggesting an attempt to obscure the final destination. The embedded URLs likely serve as lures to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d53c3d64b2e---30642740472.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4988ced1ed---fibemujulezipuvubu.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/a53a3ce1a6ad14f212acf8c10b42c083/84939926343.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ab17b9760fa---vezazowemor.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4910dc22f98937daa30e2fb038e0219b/42454016719.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/eab01d3f32b145eb0d5129cefe04e231/suxavulixijijexokipasakig.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609166b51c606---77567614902.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/f082f4d5d283332ca51131e14511b9f6/20501323072.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a91b2f5cb---jinel.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a01f7d089---runararimezolimatu.pdf
    • http://kup-vino.cz/web/ckfinder/userfiles/files/69045513477.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16095ba09ca31e---93634439578.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/57ff1f1a34ddace75ebe78c665fa0528/86601674916.pdf
    • http://branpc.in/ckfinder/userfiles/files/lamigevuruxem.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f982b085d7---38316143332.pdf
    • http://liubeauty.com/luutru/files/sejuxusaz.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945da531715---digiz.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/1dfda54c693fb5144971c8dc98be7ead/25008616123.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d23e7489067---nojepizabatimojovuluju.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/qk9amr1rt6m079tui06n5o1d7c/86944227552.pdf
    • https://bbpartner.cz/userfiles/file/rugolijuzuvixisu.pdf
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/wemumegovapedokogupazejix.pdf
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/f85fe987e2efb42449f9b83320694dd7/71976595053.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=in+his+embrace
    • 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_off0000d126.bin
1a437ece62ddaa4f16351e30df5c5deedbb0b1a79faeb6d382eec19daf1b52e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD126 10320 bytes
font_01_sfnt_off0000e825.bin
073ed22635e53a8ec89ce17aeebf57754612a619c19a27132ec9fe32f0b889b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE825 17348 bytes
font_02_sfnt_off0001157a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 16792 bytes

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