Malicious PDF — malware analysis report

Static analysis result for SHA-256 7346d862a3bf6e7c…

MALICIOUS

PDF

77.0 KB Created: 2021-09-13 07:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 40447f78e4d914c3df65b7629f191a3f SHA-1: 5b94cf05920eb1b9635355bc160248eef40aacab SHA-256: 7346d862a3bf6e7caf7dd3b905f59442b0ac0d2d3fe3f0bfed437ab5feb58c8d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites and disposable hosting, with numerous links pointing to potentially malicious PDFs. The embedded URLs suggest an attempt to direct users to external, untrusted content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a6e877a5b---41930253821.pdf In PDF document text
    • https://linhngapt.vn/upload/files/vaxiniwuzek.pdfIn PDF document text
    • https://dacola.com/upload/files/mudifuzuzofageta.pdfIn PDF document text
    • http://aucontecnologia.com/userfiles/files/35753003896.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/pokakazorija.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109102050061164.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/16733506821.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/wekilejipuken.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/78050867618.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/31fjs4avrhed01a786fejma902/2163052869.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/julufunuxomeletix.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/67762844135.pdfIn PDF document text
    • http://brukbet.com/user_images/file/xawaxoturowojalaw.pdfIn PDF document text
    • http://vaithun.net/upload/files/tituwunitujulalirunivexe.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/fezumewine.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/gopokajoredevedoxu.pdfIn PDF document text
    • http://twilaw.com/files/files/selogusavonobekij.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/jodejewagorovu.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/nofebigipix.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/76993c1ece95c8791662a2e056568b72/52125402305.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/13404799347.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e34ee43bf3---36795301519.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/68a333a7aedf19fad3bc1e6beec15a46/51813780926.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/82696700896.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/35212804630.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=forgot+outlook+emailPDF 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_off0000ca1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1D 10348 bytes
SHA-256: 7c4da4ac4e4750551e78109141047fad130797548e9ef26d71cb401dad36371c
font_01_sfnt_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 17320 bytes
SHA-256: 5f4c17333be86d4af64c21b21011da637fbc97a07118383bd9f5469ec17c6f96
font_02_sfnt_off00010e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1