Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e81ec6939d2186d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 20:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 37245fccc07e81a6b636915182fe21bf SHA-1: 6b85a298c29e8862e7d8413ee1e70a0910dc3a83 SHA-256: 6e81ec6939d2186d749747b5935b4b9d786aca8ab17b6be0c27a43225581e392
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/5f587ba231f4b60a5ea6c4fdf561faad/42362170742.pdf In PDF document text
    • http://hzjksj.com/images/upload/File/78248259912.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c4b8e9caf---lizunoxeji.pdfIn PDF document text
    • http://slsnn.ru/content/file/rumomebuginufaw.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a64b87b0---84854837009.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/91260567184.pdfIn PDF document text
    • http://gibisch.biz/files/files/xenaladukidesoti.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/69702386941.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/vovexumufuxizeteta.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106060354217780.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/dugijiguzanasirodexid.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/3c745543730af87ad77750453fcb8a6f/xajexaximige.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb03c61ef3e---fedidumetopolufaxe.pdfIn PDF document text
    • https://scriptdd.com/_file/file/mulezarasirusonibase.pdfIn PDF document text
    • http://salt17.com/userfiles/files/15753894953.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078818c9a3ee---soxekux.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/961089d8e48c8d8805d41657af896540/35836747946.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/rusajimob.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/so8r8brm6kiuvob8vfvdqvdtfg/bofabiwigaxiwowamew.pdfIn PDF document text
    • http://cmtoolsrental.com/user_img/files/86152035196.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077232cc80b8---tinimawupukadajuku.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/xujaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=wound+dressing+types+and+dressing+selection+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_off0000c2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C7 17692 bytes
SHA-256: c10dc0ac72c6334ecfba32f0807a0d52fc1e81ea96b8edb7ce250d9aba6f298f
font_01_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 11000 bytes
SHA-256: e601c68aba1e15a524cf012557115a8b0dd05db334bf8efc5f58871f957411b3
font_02_sfnt_off000109bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1