Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c80ebf655ff18d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 00:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 86fe3a8d5e5048a88619444060269df3 SHA-1: 9e2b201a6c553dd0f7f35ddcf42227fe7d7f1a12 SHA-256: 45c80ebf655ff18d1f614da4698cd5498bf6d8c062c244fe069d985ae4a64229
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially compromised CMS upload directories suggests an attempt to distribute malicious content or engage in SEO abuse. No scripts were extracted, but the structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nhahangphongcanh.com/uploads/files/55408053091.pdf In PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/q7sp37nn22prv6qbikh6vg2934/fawosukimimoxuselatu.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb20d41cd3d---xobirul.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/27417518775.pdfIn PDF document text
    • https://brod-plovdiv.com/images/64893483108.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/woxipalufinaso.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/768f1b8a19e59d2509f428407e29a109/89342121948.pdfIn PDF document text
    • https://thietbidienmanhcuong.com/upload/files/setusakagevufosirubu.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3a61da25a---kikozu.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/837cb2ba605a8c41df3256b9490d52a4/gitumopuvi.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/20780831254.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c92a0470c72---zesus.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/47433547508.pdfIn PDF document text
    • https://aromamarketing.md/img/files/ponafuxetikeramusubov.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/rosujudid.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/zegipimopedagepobilele.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/09a0485501dd52829ecfd2e5cdca817c/jejavo.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/32779932284.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/xadelapavifakus.pdfIn PDF document text
    • http://anhhieu.vn/hinhanh/file/tivonolaxevoxesoro.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/15f466f88b14e0be18deb09e66272e6c/75561869714.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/a1ea71a9686ae7d79ff591e2eca084ec/rumobufoverinomovaluxak.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070908403a2d---7663375362.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/gajamenutexelunobavofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=sanitary+landfill+design+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_off0000dc0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0F 10744 bytes
SHA-256: 1ec2e00fdca320a9299d99fe40ac5dbc02120510fa9b50f3ea297977c753b0c1
font_01_sfnt_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 17248 bytes
SHA-256: 8588ce0ac7579324229ef5c73ef3c5d50757e4832eae10fbda4bfe11b552cf4b
font_02_sfnt_off00012082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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