Malicious PDF — malware analysis report

Static analysis result for SHA-256 7423b53a04923145…

MALICIOUS

PDF

87.2 KB Created: 2021-07-31 07:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 569496d3ee9ce1894b874d2139c9c79d SHA-1: 398f0399eceebcdc1e6c671aa7f975a761a87605 SHA-256: 7423b53a04923145904b214ffca1713c6b58e6ca1d89e58bc2107643b406ea49
96 Risk Score

Malware Insights

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

This PDF file contains a large number of external URIs and is identified as a link farm pointing to compromised WordPress upload storage. The ML classifier strongly indicates maliciousness. The primary attack pattern involves directing users to potentially malicious or compromised websites through a series of embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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://crysiq.ru/uplcv?utm_term=lg+inverter+linear+refrigerator+water+filter+home+depot PDF link annotation
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/830847ed5516f5ce29ea36e65c0f0ee5/piramirakuzutavo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/flshnbinfj4bqkl6iknvn24nm5/fogofa.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/dl5pnsi7t89da18u4epnm03ct0/71531505929.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210623_220724.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b23e320cf7c---javerasipibemegezawulaka.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983d8ee8540---42931359211.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c516d32732---zuvogi.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/durisi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b80e89848---bixiwuxulilipakipit.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/23d79b58f8cca079261ff618245a21e1/mojixifajifekujon.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/domir.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/zojumomupejotanatil.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/52883461657.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/mawudivin.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/76181829975.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/63801306377.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/vebatuguxidiboramogunoraj.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/8218886590.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/paludavej.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/f4f5ba404a39ca2ca677e761ed391ab8/zinaliniwowukovedazo.pdfIn PDF document text
    • https://kamarkosong.com/contents//files/93031670289.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/63887834119.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_off0000eee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 17280 bytes
SHA-256: d411942a005980d0780205e9874697c4ae409a778ae3662e4da899fd4a4b2c17
font_02_sfnt_off0001343e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343E 10884 bytes
SHA-256: 1931401512d531ed212adaeb14ab8d40b6ec5e801726724b14593ca549c40dee