Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52717bcde07b096…

MALICIOUS

PDF

76.6 KB Created: 2021-07-07 12:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a1620de5786c3f2191db43329df1463d SHA-1: bbc78c7070c9ac2568128ce07954c8cf11b80fe4 SHA-256: a52717bcde07b096395726712ec21a85a2d7eb1c3fdf4ca23557c27c4ffc5bf7
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URLs, many hosted on compromised CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the overall pattern points to a malicious document designed for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://visit-pune.com/userfiles/file/koxokope.pdf In PDF document text
    • http://work4shop.cz/userfiles/file/xabugovekawuvoge.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/buzadisowepusirokigan.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/99cee06902b61560989253663263c7e9/21184890066.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4268814be7---bumupovanoju.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ac81b8a5f---wakipovozozivufazakebug.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160910b8395159---84507578979.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/65544498584.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/22304492637.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/7c816cdba4f165fbee64202c4ad34ba5/sifanowanegekunale.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/26041194626.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9aa18fc1436f604014760c124da3555c/16335455129.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/90be4562cce6b1b10227dce1550e7d83/sixizovetero.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608763b47fbac---momiwadiduj.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/62013820415.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/xewividojitijagokesamewus.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/dozijenaviguvow.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/1282660087.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/87705694807.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/41357617666.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/0999o5tno2qr7s49cp0lgnpl2p/44788426147.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/395315407.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3b387bbe3---worevetitagebox.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/8qrg89v6s0p73b2l2dd1clqht4/nepakuvovodiku.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/vojogomuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=exponential+regression+in+rPDF 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_off0000c7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 10512 bytes
SHA-256: 9a3819f6daf84618a478bf97e90c4883f032573616ba80f34a13e918002825e8
font_01_sfnt_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 17144 bytes
SHA-256: e8bf2f47b3c86090bf8c9eee1561ad90fe5af6c636a0096b7e628110eeeef22a
font_02_sfnt_off00010cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1