Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e79f92ef2c0dc8…

MALICIOUS

PDF

172.2 KB Created: 2021-07-02 04:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dd2f4974f8124260cf674bf567039b63 SHA-1: 8bcfae3bec147661f016d8f8707b785c1d8ba52a SHA-256: 86e79f92ef2c0dc87f509701b08b55d705da42a35da1063c6456b4fba3e4f5dc
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs supports its use in distributing malicious content or phishing lures. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9707

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://pistant.ru/uplcv?utm_term=come+let+us+make+man+in+our+image PDF link annotation
    • https://thietbivesinhanhhuy.com/asset/files/gedefexelelujutisi.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/78756405407.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ai3id41om2roc47cgln9hf1fon/96708084496.pdfIn PDF document text
    • https://energooptima.hu/upload/File/xemisegeneroma.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/51950772296.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/10u6hnuk3gqo43g1m5kf2bf7j1/49337671657.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/oif02dkg11kvfvls2jag7gk3s2/bedijidakuke.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/zixigosutogibor.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3c5c1df5fdb0c325a029b7b7a21caca1/16403403250.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/kuvuvuv.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16086acfc0c43a---memufuzizitikizorede.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/sofuvewijofewetu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/dff3e0cabc46407f3d09309aa1ad316b/67401646968.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bda419828f9---belumosi.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c6275e436923b165aa61075d537651d4/6620989801.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/85237875524.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/kemazexakiridu.pdfIn PDF document text
    • http://flgr.ru/files/files/putitepediwab.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/kvu6gqlaj45568ktr8vrqphd65/53709293526.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16099f39a10ffe---20924609008.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/19b8a16f4fd1f141c363e005a75ed111/kisakaleritudeg.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16083c15a755d4---49535056092.pdfIn PDF document text
    • http://alltechsro.cz/files/39144789236.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/2nc5c0952tbvlld5drrj2i6e33/vuvemafomiselana.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00023044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23044 18332 bytes
SHA-256: 982088317ff6a0c30ea5b4ab0b75a11096141a140f1d789f59e4eb9e1f0602f5
font_02_sfnt_off00024dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24DBF 10676 bytes
SHA-256: 77a03461317b71f0b2a7cf0046e96ea19b88df003e68aa44fa41c52b117c3e60
font_03_sfnt_off00026642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26642 23576 bytes
SHA-256: 72a2edfec4d096b2085deafa41fc263a86951863b54c0ac1f39acc0c0990e4e9

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