Malicious PDF — malware analysis report

Static analysis result for SHA-256 2751f8b29ea765d3…

MALICIOUS

PDF

79.7 KB Created: 2021-08-07 02:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e0af0c3284cdc1e21058961613ad0d1 SHA-1: e607ac11e1d3de1db524be9b475d57f31db37a5d SHA-256: 2751f8b29ea765d3aa4d5eda1906c2218cd91ffb41620a4558f909c5c00e11c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is part of a link farm designed to attract traffic through SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=nova+atualiza%C3%A7%C3%A3o+azbox+bravissimo+twin+transformado+2019 PDF link annotation
    • http://cleangroupbd.com/ck/upload/files/wepekimadizunidoduleka.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753187ec11d---16811963358.pdfIn PDF document text
    • http://darstin.com/userfiles/files/vojekenobomitawujalejada.pdfIn PDF document text
    • http://klefmarken.se/upload/file/bugitedokojaza.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b356728f5---98503359799.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c637a95b7b9---buwisegenuvajusuma.pdfIn PDF document text
    • http://195exim.com/datas/files/xapemififegipumimave.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8949f0cea9---lanudojom.pdfIn PDF document text
    • https://digireg.sk/upload/22085546558.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/resoxim.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c03cc7bdd9eb301bc2fada82f9e9b619/13185666553.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38270ad5f7---navojojogirevenoxogevajaw.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a172bd5c51---89342033716.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/letanu.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/41969855230.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/darobagenubezafizaman.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/4el33gv6p3rvhd2tn8c54ujsn4/poxixerodo.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608f22f2ccd26---21798446015.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b741531f7---35010420404.pdfIn PDF document text
    • http://susutour.com/userfile/file/61326247618.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/gimutol.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/55540405370.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/83cfbdab178d3a5e5324f4866071f677/tuvetisabotopujanedesu.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/xitosejarifu.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210726013038.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_off0000c933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC933 19732 bytes
SHA-256: 69d49c4bf5e0d9c82a1c66634e9d2e9ac0f6b4979717e5fc8290e4af002fd032
font_01_sfnt_off0000f99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 11840 bytes
SHA-256: 5ade5826ce1b9433a5ef5a5ef5f696e3b369fa7d783ad6f6b0c629b2201cff7f