Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdcccdc83aea3b0…

MALICIOUS

PDF

151.2 KB Created: 2021-06-10 02:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a7f29d526d6d7d29204b93e1d1fb6bb8 SHA-1: 176cbedc7db38f5e08901e0c292f73c7c356eb99 SHA-256: 9cdcccdc83aea3b0b78b110f0d3777ae052c788b8709a6e9b1a1c4495a23380d
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised websites, many of which are hosting other PDF files. This suggests a link farm designed to redirect users to malicious content, likely as part of a phishing or malware distribution campaign. The ML classifier strongly indicated maliciousness, supporting the interpretation of these links as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

Heuristics 5

  • 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 https://pixomot.ru/uplcv?utm_term=xxx+sinhala+new PDF link annotation
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/p9qs2vm5oamnmkc3hsapbp2014/radofixeponejekamujilifuz.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/vopuridi.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7e2f1i57do1hia4vg4an3unob5/64261399272.pdfIn PDF document text
    • https://computerzone.pk/file/romadowej.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/dafe6d21a15d11e629d00d4e9ea94773/71659161913.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081fa51d27c5---ditebemovesum.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/kevavufavifaremenepufom.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9f649cc5---padaridoxuvetiboxize.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be808d49a9c---3278730711.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/wijukatiso.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/46bf40a433ceda13608fc5cde12c84a3/gukevekagagubafiwopobolep.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/70d7891c514530591d7bc46c7f296f74/rekigukara.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076173cc8990---97108287965.pdfIn PDF document text
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/49078889031.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3ipir7j8mpoakvde0ts13h76qo/genemejawutigu.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160884247b7f48---nemovokubuvibowivamop.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c706176ba9---27810664479.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A82 1872 bytes
SHA-256: 738d8f9c23d6be92f65238c3c1ee487b8081201c19132da41ee9b46b20240031
font_01_sfnt_off000162aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162AA 29368 bytes
SHA-256: c9f4682c618d7233e3d310580fa83a96b468d523a8c0ee97f0855ba2d7f5209b
font_02_sfnt_off0001bec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEC8 4816 bytes
SHA-256: e5cf825532e873441c97fe97a61a8588cadfaa994ce7e395996d9df96fe90b04
font_03_sfnt_off0001cf34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF34 4716 bytes
SHA-256: 23cf75db6cf61b4769580c9d80bebed388a5db81d78d5bd8e4cdf4a5e46965e1
font_04_sfnt_off0001de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE43 10076 bytes
SHA-256: 7dcac2235f0cca81077d9d1002a81fe8410ad7d2f453f6b5df6f6393d25eda41
font_05_sfnt_off0001fdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FDBF 9252 bytes
SHA-256: df2ba52dac3f378103817829cd37a97fec30e8dda1730fd6440d9007417b8e34
font_06_sfnt_off000217f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x217F2 12404 bytes
SHA-256: 555ed94d8dfe4042d5af6dc222e16ea64cf33c48627b060197580fc3f654d198
font_07_sfnt_off00024004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24004 3408 bytes
SHA-256: 663e4c86fcb7342133be047969d2ca988bf04bf2efb4aced29108a29aeadd81a

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