Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf8f32cff9c50b0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 02:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee63406ce911d6c9e9db1e779273abc2 SHA-1: 20e0198baa481942901ce969f929f2c5724c31c4 SHA-256: 5bf8f32cff9c50b0d924ce9969cf98d573037f89676729761bcdc677bfcfa135
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://esterkins.de/ckfinder/userfiles/files/41166409978.pdf In PDF document text
    • http://elskup.pl/images/assets/file/42426496270.pdfIn PDF document text
    • http://fabtur.ru/upload/files/tuvugeze.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/9200752366.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210920032430.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/92252854054.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/87053518085.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/77118136409.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/tavewosawe.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c7d30e0b3c4c02c4be597ffc51e9cd98/96040598803.pdfIn PDF document text
    • https://cakkue.com/contents/files/votibagufopuxakux.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/69055216492.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/40493739003.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/gefuretufarenoxivinovot.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/senerunasepumopalejusajul.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/83341657e9811f9a80cb31ebf6ac0e55/sozomejakutikewefag.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/66779098693.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346ab51fb2d---26867467619.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/linivenopidusetanuva.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/aeb90ab9bfb713aacd32815ee5580a2f/kupapofula.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/vubuwisuzomi.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/88803065317.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/88386607282.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/fenivupovujorumusixeso.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/zimenadigerirexilut.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/82759676417.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cara+merekam+suara+di+hp+androidPDF 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_off0000de5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5F 10736 bytes
SHA-256: d99357b1a9117f510e0e06988e4b1918bd52d2f01807f08cf2fb15aeab942c62
font_01_sfnt_off0000f6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE4 16932 bytes
SHA-256: 1978faf767622a1bbf4b1967a456e7c778a2890fd898d36e3db4891f2c0242ca

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