Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdd986124bed7b7…

MALICIOUS

PDF

93.6 KB Created: 2021-08-11 04:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b0f0b510074d57fedf1a3c6c72ec30d SHA-1: 26dde6390e849cacdc8d9d9e2c9d5fd1916da490 SHA-256: 6bdd986124bed7b778d5aa073acba8087d272719b694a370de1f87315ff0ea70
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics points to the T1204.002 (Malicious Link) technique, and the nature of the file suggests it could be delivered via T1566.001 (Spearphishing Attachment).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pixomot.ru/uplcv?utm_term=actividades+de+motricidad+gruesa+para+preescolar+pdf PDF link annotation
    • http://faisaltowel.com/survey/userfiles/files/76594051855.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/81796511545.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a18cd758f75---waluninebawederitiniziden.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/89627484121.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e94a9ad20e776fb14b9b3ba7c5f828b2/69620376792.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/e0g0k5vjsm8t9g5acichks9r6f/17822616178.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/53581360189.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/87585551299.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/54784679569.pdfIn PDF document text
    • https://goldenapp.net/file/pavunafozejigozimawuriwe.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/61393533126.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/65771522649.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/bf7c33099f449a49876e97d20506415e/55565775208.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/91895901179.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/ac49630bf353b7d60a5eeed6e3c7719d/12218704525.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/c740ffd4ba7ef466b983b6a2377855a0/67935366986.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c62eba9a712---2114073439.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/tsoij6iduaq8jo5skqrod7hcb2/fawano.pdfIn PDF document text
    • https://lavaecucebrescia.it/file/46843917407.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/n320oskt984t7kajdluho9rrgp/tujarono.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2be3831f913f36af114a50c52e994ba2/9265650409.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/51182977405.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_off0000ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF21 11004 bytes
SHA-256: 110ab3606fec0f606d0bf59f783af0f0e9b60b473927a07da841d8b14472848e
font_01_sfnt_off00010890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10890 17784 bytes
SHA-256: fbf0284ac6d41d057f37bcba38afbd2d0e10da204cdd9cfcc184bac65af052cd
font_02_sfnt_off0001357c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8D 16852 bytes
SHA-256: c84291a86e93994e2db0026b942a06cee4ce2c0ca8df5e9952d0b98187992b56

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