Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35bb34729ed7c56…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 23:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e26f109eec87785be27acc424cc9dc75 SHA-1: 0bf917e5f59f4bba04fe71dbb9ab6fd567a9bdf0 SHA-256: c35bb34729ed7c5634669495831aabb2e101eeeea4f50bee6d2ab1493530cb9e
136 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress installations and disposable hosting. These links likely serve as a link farm to redirect users to malicious content, potentially for phishing or malware distribution. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://liubeauty.com/luutru/files/sabirutere.pdf In PDF document text
    • https://cli-kh.com/uploads/files/202109141838184799.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0d19dc49c---98553971332.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/25330391092.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/79897677893.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613083c67ad92---rojijozona.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/zagawasititimimozexa.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/73092988230.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/taferenuxaxes.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/17534524017.pdfIn PDF document text
    • http://freewest.at/pipulukexezipadisi.pdfIn PDF document text
    • https://mimpishio.com/contents/files/71090247123.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/xodobixezodajebi.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210924093027.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/58224911584.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9av83nmnoobvis257jjoqasjo4/38365736846.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bad5bc085ece5eaad37ab0933df877b2/supowezido.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/28374626097.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109041043301059.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/30039724025.pdfIn PDF document text
    • https://securitydm.com/slicice/file/fusifuvafen.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/54647789888.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/d35751e78942381f8b30eabe190896a5/baxaxededanoxarikotadarim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ms+access+apkPDF 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_off0000b2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DE 9892 bytes
SHA-256: da57be244d83dea9f18417d91b7574f2724e8eeb1ffbf4015669cdca1ae6f1ac
font_01_sfnt_off0000c8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 18412 bytes
SHA-256: f2d6189344ffef15920262517380fc3e5b09a747e3eaaf6285b533ab71b92961
font_02_sfnt_off0000f8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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