Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1d7b7b88712600…

MALICIOUS

PDF

77.9 KB Created: 2021-09-01 11:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 99b3fac22b4573df4a0b1be9356418ea SHA-1: 01498d9f39bfeaf3d5358c71e25e6953cb886b72 SHA-256: 1a1d7b7b88712600c7543021e9bd4d7e9e445937c826b1d877730337c3adff33
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains flagged as compromised or disposable. The ML classifier strongly indicates maliciousness. The primary attack pattern observed is the use of a link farm, likely to distribute traffic or manipulate search engine results, rather than delivering a direct payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://analogsys.com/uploaded/file/71225267560897201b4ac3.pdf In PDF document text
    • http://annabarons.lv/files/files/88906434239.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/veduwuronuba.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/11701001900.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/fd9b0351afaff1cde5b3ba52266eb135/durilum.pdfIn PDF document text
    • https://jotelek.hu/files/file/xudutifovine.pdfIn PDF document text
    • https://msiutilities.net/documents/31394193642.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/timowe.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/bipuvagozimutifipub.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16093fc93631f5---talomapefir.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071283148924---bajulogujatuko.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/989ee2f0b0edf1614827ce3f7a7401c7/gezewifasu.pdfIn PDF document text
    • http://hevolta.com/upload/file/67896424472.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/xulaxetovixojujonovawum.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607374889c6bd---74022227095.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f96b24d3d---zazimevidadajulozedege.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/88000653228.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/kisezuxerusozazugefo.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/8573964036.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/1c15b0807ee3ff94dbf65d6755121c8e/68566672029.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ddbf04c1c6---77775774.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/18760997784.pdfIn PDF document text
    • https://aarhuskortet.dk/images/file/89617953737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=practical+design+of+steel+structures+pdfPDF 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_off0000cefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFC 10896 bytes
SHA-256: d64a613edee9f67f4a077cb584bb5d87c2d7d051faeb0e3a368b092aa0ca99af
font_01_sfnt_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 15952 bytes
SHA-256: 56ef7daad8d65cae00f291ea2934a1c21a345a06b5013884f6f20a0d051e2fcc
font_02_sfnt_off000110df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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