Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b12d60c23b326e7…

MALICIOUS

PDF

71.2 KB Created: 2021-09-07 15:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c00490a1197a4da55af4d8948c35dd0 SHA-1: 5020592a378fe7638431196c82b0f997b331c652 SHA-256: 5b12d60c23b326e720b9c9771e7c8694284fcdd532d5f4f77caa8897dc36dbfb
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://am-system.eu/ckfinder/userfiles/files/30525202426.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161050418dc971---zumudebimidevodil.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74a3bed3f9---27461714456.pdf
    • http://clinical-pain.com/pds/userfiles/files/telarapunadatobadoriramu.pdf
    • http://huntland.hu/upload/file/4822416936.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/hp40241e7bq8fb9l1jmq2ba513/49301598547.pdf
    • http://olech-rzeszow.pl/userfiles/file/rokarorezapoxer.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161078b1933d38---fananuniwebadotosifilow.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a153f3309bd---97444345843.pdf
    • http://gtshotel.it/images/file/kilezot.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/s8d4k6ecgtaacheovehfer3psd/wurisur.pdf
    • http://yfatc.com/userfiles/file/xabawofejutigitogaful.pdf
    • https://cesiedizioni.com/userfiles/file/24194071828.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/7ff2da9d57048c795fa30335fb42c4ee/budetaleduterobe.pdf
    • http://lumieretvie.com/userfiles/file/45670573443.pdf
    • https://www.campacinter.com/image/upload/File/kavekofoj.pdf
    • http://to-kajihan.net/js/upload/files/11734908583.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823ced99653---sabazotokurezipogemeziwo.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/79158603094.pdf
    • http://hotdeals24x7.com/ci/userfiles/files/dojubabuwuv.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=interchange+intro+3rd+edition+student+book+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_off0000b2f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F5 16792 bytes
font_01_sfnt_off0000cb0c.bin
04b5d7435043cfc9fc54c65c77705e1e534f45603b16d80c4d377dccba6a996f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0C 11308 bytes
font_02_sfnt_off0000e534.bin
d603e02ac183b178dc41ab162abbf5600833c61273d6028c9446e11d3c8f945c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 16272 bytes

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