Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d42095f1dcdcf6e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 00:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6bbbbdf72cb61284083ed9cbb09fede SHA-1: 00159e4a9f5238889b2e09ecb7b6f6e99993e615 SHA-256: 5d42095f1dcdcf6e690a65dc1296a519e467cdfae6954bd0c3a8ecc1f6b19d2d
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the primary function appears to be redirecting users through a network of links, potentially to deliver further malicious content or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ajur.rest/uploads/userfiles/file/35620897832.pdf In PDF document text
    • https://monyetmesum.com/contents/files/gajazibibewetipigujezixif.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/kopivevafimidugivitisar.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/70068395464.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/083746b303848a2658165025b144a253/jalibom.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609837e2c9e95---95089689410.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/3e859304628fc63fae368ae858a476ee/22660827405.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/debow.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93d1aa099---kevetuwetexazive.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e521c42d61dc1f07f57e46276ea2b845/narazapifigaril.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/62678261104.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/b0ad57df371466dcf0c928677f07c4c2/53685535209.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/zoponukomifidum.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/21800199718.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c236009b653.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fdeee0342---62526752637.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/36719049458.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/71579180958.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/46d238c68c2d38e0b45016210de2f555/3180069244.pdfIn PDF document text
    • http://carszana.com/image/upload/File/19899460148.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/937d6bdb8288343eaf1aebfe559c7ebf/85437774740.pdfIn PDF document text
    • http://indecomavo.pl/inc/80086032069.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7e9f2bcbb431ac1b383c2428d5751a6f/44894959212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=xfinity+modem+cgm4140com+manualPDF 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_off0000e05b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 19136 bytes
SHA-256: de297a7426f6f797978e569d28eca6e18e319391dc03be5db7da67d2b47a2d9e
font_02_sfnt_off00012a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5A 11024 bytes
SHA-256: 609ac6bbbe8c1dd27bd0d031b0c4b044984d4197e8ccd10262b310d3aef33515

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