Malicious PDF — malware analysis report

Static analysis result for SHA-256 8804d125fa746956…

MALICIOUS

PDF

86.0 KB Created: 2021-07-21 00:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3a1647d2fad29d96b16eddb8093fdffa SHA-1: 6068cc8f3921dee2f3e14f1ea22f0a2fc3ac2502 SHA-256: 8804d125fa746956b4de222c729d3240c7c3ff3ff3ea3d9dc9f173feaf62c2d8
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the heuristics identify it as a link farm on disposable hosting. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdc3fc5035---gojutiketitozew.pdf In PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vvi8v0u34f9fsdqq5tu50iv1g7/10839732441.pdfIn PDF document text
    • http://seeandhearbetter.ie/img/shop//contents/35879484386.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/kurigozudiwakatulodi.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c07aca76a1921574efdf60a8b16a2293/70736752169.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/47294815055.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c021e49a4f---86696310285.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/fewejitavavu.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/zewilabuxibefu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160993f32d3579---48374610274.pdfIn PDF document text
    • http://soles2walk.cz/data/file/xunub.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/42164601322.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f461596bed---75421906318.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/67342547035.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/fubupotigevavowuvutudi.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/26153093356.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076832590da9---wufabazijudixo.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/25830743850.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/xerusejikimiradit.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b668d609---rozoveluxuke.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c8800688d---41734664152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=english+syllabus+for+5th+classPDF 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_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 10952 bytes
SHA-256: 37faf5fd4935a706edaaa78b43a14d7f932a0957cd1b9bf75a936afebd67acc8
font_02_sfnt_off00012014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 16536 bytes
SHA-256: d1b0758122b098086435541bb344693aa190cecd67ea74938772074adc81729a