Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b455329ac3993f…

MALICIOUS

PDF

85.4 KB Created: 2021-06-25 23:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4226f5a3196c9ad74cfdfd53a1c09ad2 SHA-1: dd3409616643d491bf63e2991c7915af6eef4d98 SHA-256: 92b455329ac3993ff36db5ac2a94589887a63f80c64680b8e51d2c8bdcfef103
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm to direct users to malicious content. The presence of multiple external URIs and a high ML score supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://allnatureint.com/userfiles/file/36967233248.pdf In PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/12471382479.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/29521716d17a5644397696de389685ad/pazivuxenumuxavivip.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607630da314f0---lunagurarinowasa.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/33584956740.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/xanamilidi.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/4ed4470c43784c8531af984dec184895/62312627893.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/a6pi2ca11sji8mqbushm52ofd2/51509381324.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/46205463441.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/3923316786.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/balopudidikutezosidu.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/wafamegiluzufojixu.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/00fc90263c53a1688692f67bd2843317/xidomamixokuxin.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/21368246979.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8657fc5430---baxilazijuneririmuledewo.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/70451503628.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/61ea46abf1aca36e11097fdc938c41a7/69457155767.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/489e34379262c60b0b159909b9d070ec/magabitemavuwusege.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/37e957f1a53eda9c9e2922908e11ecd8/biwowutim.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be6adb78546---76657775039.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/natexisav.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/27000837700.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/76363801039.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/3b330ffbffc7437984d2373cac5f2391/68472667733.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/goxerizogubizelududeduma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=quote+shawn+mendesPDF 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_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10399 17496 bytes
SHA-256: ef48ced6d7b03a87a5c50e979bc196872ec6d9154278e91c88eb90fdfe99db26
font_02_sfnt_off000130cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CC 10520 bytes
SHA-256: e8d495e05ac8d2a8278fb412cee984d8982623396daa18f65c05b7f81d790131