Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d8b6fc51e70a01…

MALICIOUS

PDF

77.4 KB Created: 2021-09-21 01:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 23814f653f4e209e2f49e5b5e685c280 SHA-1: 7d0e34a6b912e6c778c68be6fd609b6b4cfaaef1 SHA-256: b7d8b6fc51e70a01f565e24fb8b658bdb7b96e753c41f0e46660a37cef85f06a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://huntic.ru/uplcv?utm_term=auto+hide+notification+bar+android PDF link annotation
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b21e85ac37---38049394656.pdfIn PDF document text
    • http://hla.vn/upload/files/63118765534.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/rejasonitapexarijanoxil.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/vesej.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614860531d784---84403778469.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109170424451467.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/63183076891.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/gawatepatadenatolezejiv.pdfIn PDF document text
    • http://kccmaul.com/files/files/dutakatipozexafejasujokun.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/mibezemixanalupugezizexar.pdfIn PDF document text
    • http://rooptex.com/uploads/63591349659.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/menimiwofuwevatokod.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/popadoporazikojumavapom.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/navata.pdfIn PDF document text
    • http://att-na.com/upload/23361370403.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/sadovosojarufigaj.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/68885945970.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/mojix.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631613662.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/70665525504.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/rorafogubirusogilesipopog.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/14449180543.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/9b98f3c8d4e25577d14bf0bb4c9e42b9/67789879650.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/laroxege.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/nedoxenojinuzumojo.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 10580 bytes
SHA-256: dae22a4ac4c9e9bf9ffdc9e3e2ebf0fe5f1a5470ced6406a4fb76fa1ceac82f0
font_02_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 18520 bytes
SHA-256: e7b27e8835cd834772652677c90546d3d3c3173b5adeeb291dbcdef60f2302ff

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