Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b4fd8b1b8f9eeb…

MALICIOUS

PDF

95.1 KB Created: 2021-07-24 08:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d304c9f7b7e0c2ecfd181ff63f23ec0d SHA-1: 120b755ca906862cb88e698c60c943beafdb028f SHA-256: 67b4fd8b1b8f9eeb5960c5b55c4ca2be6050f1266a1f97b17d4beccda67a8106
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating it's designed to redirect users to malicious content or exploit kits. The heuristics suggest a link farm strategy, likely for SEO poisoning or to host further malicious payloads. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/8aff7887e49a27548f0b25428b35730c/foxejubevivijemo.pdf In PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/zoxeguziwegikiguribativez.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160748142113fe---jofebokesavofabaku.pdfIn PDF document text
    • http://jkohut.pl/file/vigasizidulotata.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210629122619.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/6441126506.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607408c49d77e---nalatizeb.pdfIn PDF document text
    • http://kokomo1986.com/clients/31029/File/3726127643.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/qcicmfhfmer17h4m4u1jet8me8/36672190269.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/949e423f8ec5c34ab8e58e387e0168aa/sumozujox.pdfIn PDF document text
    • https://pellevah.com/upload/files/wenajur.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/polixeguporavuzeza.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/91534835222.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/defevabakuvotexitivudibi.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a8445844f81d05d77f2cf3a502aae3ee/71837145881.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/zefilunedineraxafexawox.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e451d3892b---58698534292.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/musurevajifijudonulemepe.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/42157524007.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5006cc7fd---17768516002.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/12224037445.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/8728d781221b464c7840f04969ebd744/zulir.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/93920846043.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/36790914001.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c8caa82f8b5---82959956642.pdfIn PDF document text
    • http://soleilboo.com/images/uploads/files/xovixinetifawutopudogejid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+hashtags+for+tik+tok+2021PDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 17020 bytes
SHA-256: eb4cb3ce9ec3f593c4d0ef28acbc42c5c7cee545ea8c2e55767e9f4e863ad776
font_01_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FD 17196 bytes
SHA-256: 949e26576f1867481c154731ac1858d298e2bdcf6e85966c200a4751f17bc200
font_03_sfnt_off000154da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154DA 10780 bytes
SHA-256: fe8bf2b423b445681cc3ff55b900f5308bd98676d08784d0f937d7ee0bb29a85

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