Malicious PDF — malware analysis report

Static analysis result for SHA-256 955b2273919f45ca…

MALICIOUS

PDF

87.1 KB Created: 2021-06-28 12:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe37357d191c489f50ae32f4f9f64a37 SHA-1: 4856342a503d12cee9dc8ec860e7c0eb5790d69d SHA-256: 955b2273919f45ca83479982f7309ffcd7251da3b93287b6b872ad692933634d
96 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress sites. The ML classifier strongly indicated maliciousness. The document body is heavily obfuscated and does not provide clear instructions, but the presence of numerous links to potentially malicious or compromised sites suggests a link farm or distribution point for further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/77c058a46758cad6afedf300994c387f/pebiluvegarivorikufuzu.pdf
    • http://kingalbertltd.com/uploadedfiles/file/lanuzukumupanupid.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8a3d218d9eb057b10396fb8cf3ced613/botosabapi.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dce0e10a1d---9215747961.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/4eo69ucjgg3gh4abnvi1lcq1q4/68925564464.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608668907e49a---2057454007.pdf
    • https://mediaget.ru/userfiles/files/14978502683.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098683cbc1ad---43614104070.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/c3385e2a99e65d5261669f37067aa8ad/zulogibuwuvagu.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/90afa5j893heabl34ie0e9rd47/42838386872.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/crtj1cngp1q0d14rt6h4sp1p62/bivozitimukure.pdf
    • http://zartmobilia.com/userfiles/file/20210618052251.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/8c4445b8520e7432f9519471d722deec/42044121274.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe2593590---10486786339.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a498e4ca0fe---golarujatapogovu.pdf
    • https://branchennachweis.eu/userfiles/file/25388341202.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/fijutagenanofosolij.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/5955b58269933667d1a7523c7d0dc7d3/80986846746.pdf
    • http://ck-kutnahora.cz/gais/image/file/setodudebubub.pdf
    • http://backupcenters.com/userfiles/file/mijebujipire.pdf
    • http://studiovalentini.eu/userfiles/files/tiledodokibanos.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16081c60cdc560---sezomelerefubetatotodo.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c881fd79a562082527f8069989cb6bbc/veloluzi.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160965d2e1bbab---nodevafubuwufasafor.pdf
    • https://morabia.fi/images/file/mowupesotasikowozidir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=meaning+drop+off
    • 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_off0000f3c6.bin
61dc78235841ddc9ee43207852de4736fb8d6588e1e5ab46d81fdcabd6a14974
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C6 10352 bytes
font_01_sfnt_off00010b00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B00 16792 bytes
font_02_sfnt_off00012312.bin
c813e2ffd07656f78f4d3e94af926d9fb4d7e735acc469e886646018adfc2e36
pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 17044 bytes