Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7aff7fe93b6841…

MALICIOUS

PDF

89.3 KB Created: 2021-06-26 11:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3d345b51dc99aaa5c3049ffe741a977d SHA-1: 3cd7637d6bddc1b19987c6059a6ef70d0737c9f7 SHA-256: ee7aff7fe93b6841fd7f8a7aac089a89b829e2de6e22f0bcfc4def88ce7ce252
156 Risk Score

Malware Insights

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

The PDF contains numerous links to potentially compromised websites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/1947db92a4b944faa869b505531e2380/79499307905.pdf In PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab79175a95e---vitizukodolopemepo.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/waganorexunifesogido.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1f75e313b---94087188658.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e4e8197ab037f3a518c088c5ca0afd99/kidepamuretosiva.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608345dce7d75---gopibuzamolaxodeke.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/92847817402.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/14108169385.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/12467182047.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d83d44b315---93104215463.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911a4a712d9---gujasitaninororu.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/95617941330.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608633c8e3106---60070556326.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160835855ae4fd---fenilokorakopi.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/fugufawesolowos.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/jiferadolexiwozuxov.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/lakeze.pdfIn PDF document text
    • http://nova-auto.com/upload/79070428957.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/86833601716.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/nesivigajenigi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4e447fb3---guwiz.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/31130619576.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/383844a2e487e9354350fd684ee4d247/6832610445.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0012c96cb---giwuzer.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/72f3c9cd3aa6ef4eb147ef9a783ff453/84299206392.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/50314565038.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fallout+76+how+to+make+backpackPDF 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_off0000f904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF904 17544 bytes
SHA-256: 321e82d7783ca0798a1e79268ac781a15addd4705cdaeea4f8773533fe5bae4a
font_01_sfnt_off00012680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12680 10788 bytes
SHA-256: 4766a6c3175ae4459ca7c863a170a68114c84a6d07bc4fc7ff4d40121493bb3a
font_02_sfnt_off00013f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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