Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ac35e411ba85eb…

MALICIOUS

PDF

88.6 KB Created: 2021-06-26 06:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5dc30b2a613502c9fc7610ae310d8c04 SHA-1: 425a5718835c980aee66a5fedc20ec5e541736ba SHA-256: 43ac35e411ba85eb98e76c49acc58ab58c6cd7f279c50ad92226a30650a72b9e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ead4277cf1---basolonivob.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d472349c3b---ravowibakipobolibaresuve.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/6mkmuvo2thgd2i3ev4v6bag2nv/texirujinusapupasoj.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/eae0b764db9f9482e4880b2345399c8c/dopuluvanezi.pdf
    • http://originalcheck.it/public/img_admin/file///xoxowosojoxosi.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/70elpmjf5k94692rhd0dii374s/kezenoxepowivawidajaxawuz.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c484b2302c9---gezusupepozelonob.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a52af009f430c078d5cd08c2af2ead7f/rogiwo.pdf
    • https://cplastik.cz/data/cms/file/41158987130.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/6l1hvdc9ih86c30a9r6u8gg1ej/85283144902.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/b47b14889ecac74986158cfe494eb477/56774071314.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6561984a64---winavojal.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a92699399---levaju.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c315e5df946---18681040881.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac58c29724e---55628685604.pdf
    • https://a2designbg.com/userfiles/file/nasigi.pdf
    • https://dubaimotorcycletours.com/uploaded_images/files/pifazatudekiturenokujifot.pdf
    • https://xlspandoek.nl/userfiles/file/xulumumekiz.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/3c7fcb4f9f894dc83fec63f942b466a5/fubetirifawonisigid.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/421e2e9c7589d40cae399dff6e563eab/kixodis.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aef9d3010e4---nezoje.pdf
    • https://progin.swiss/ckfinder/userfiles/files/640891320.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/937cc2a19e8dd51957d1816a8d9d7b3d/kevoje.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/cbad56cd9127126f16b33641a2fbc4d1/wowajivesikovajipaza.pdf
    • https://hostingalani.com/calisma2/files/uploads/jufafumexididosixi.pdf
    • http://prof-cosmetics.com/upload/files/tevelifiwiwugotopipunotu.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/pofezavedutabozuxapodiri.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/03t81glji1a6qumvlafi7arcp2/57280787276.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=7+skills+of+highly+effective+leaders
    • 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_off0000f7c7.bin
5a707408b35ab59247880a89c3bf4fbcf6c6f302daaa8ef478ec67191cf3bb55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 16212 bytes
font_01_sfnt_off000121df.bin
024b5593be38b7a75b66a8d6b4044f5ef0c4d3bcdbd3b2201f2c8e6c4d276c21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121DF 10876 bytes
font_02_sfnt_off00013b0d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0D 16792 bytes

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