Malicious PDF — malware analysis report

Static analysis result for SHA-256 834b33827158ed8f…

MALICIOUS

PDF

78.5 KB Created: 2021-09-19 11:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 07d5fdbc89844da2ce159ab126fedce3 SHA-1: 759e1c1b5ca2b742f6ec89cc023e91cec8d656b6 SHA-256: 834b33827158ed8f6688e4ad06f3cbe1e1087530c1a787f84da278ddd4ef506c
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 or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://staractivecollection.com/resimler/site/files/71154080854.pdf In PDF document text
    • https://havadisname.com/upload/ckfinder/files/sirefukuzi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/losopuduvadovuxixuzutokuj.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef89e51537---18781474898.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/16/file/tubemeputevetokex.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/70797071760.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/putegadofovafosoralovu.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/19597479335.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/sanalaxuzinakebinava.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/88057769238.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/timixorudid.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/fakewam.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/62589ffdb7ec0c82d604a12c9c534b2d/38797092542.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/42650007632.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/rejusigu.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/25635218470.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/84488009101.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/f204800ba7407df3de073d4503d003b9/72052527945.pdfIn PDF document text
    • http://poliinc.com/upload/files/xowepoximogogon.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/bewepufe.pdfIn PDF document text
    • http://ctm.it/userfiles/file/nisidas.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/38167154220.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/bebipaxituwilaxufewoxu.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/71074324949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fifa+2014+android+apk+offlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC534 20480 bytes
SHA-256: e6d6b22f0026b78842bc285de4bd20e9de1359cd1bbf9c9c7f4454ff70335f5a
font_01_sfnt_off0000fc10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 10668 bytes
SHA-256: d51bf2c1c157a31137d63c801bc4f6b3c6fc8069461f458f1beac71d4a3fe5f0

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