Malicious PDF — malware analysis report

Static analysis result for SHA-256 266bb13ebf36db27…

MALICIOUS

PDF

72.1 KB Created: 2021-09-05 11:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3758e030354115de182919427e75e64f SHA-1: ef20fb94e7b731e9a433aab8ad4d60c390284a22 SHA-256: 266bb13ebf36db276720f63301c10b3dbefc8454eaa85951ce116d90e41cc906
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://a-swiss.com/upload/userfiles/file/lesafakizativu.pdf In PDF document text
    • http://qtjdb.com/UploadFile/2021/05/10/file/20210510_201548_149.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/36467848736.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021072606282466.pdfIn PDF document text
    • http://veitali.com/upload/files/ziwufu.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/gagemage.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/70386309424.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/3418220712.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/o8iefgscn4i4t752u6qks2m4v0/duzodigixepisan.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/44737206911.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/357e4137bab8616c5ffbdb6f121f7d82/raxurifutekijol.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/51169982535.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/74989946740.pdfIn PDF document text
    • https://aedwea.com/upload/foto/57899685734.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb926ac456---84564959512.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/20491050877.pdfIn PDF document text
    • https://biocoils.com/img/file/62745083147.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b434f8616a---lemudugakogeroxarulo.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/43169357135.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/bowizezudekavagofuzidiwi.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/50428224562.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210625034449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=subject+and+object+pronouns+worksheets+7th+gradePDF 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_off0000b61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61E 11328 bytes
SHA-256: ebdc2366373f277c290ba0c2466ffc5220138ff5b72343efaba245ef0aeec74a
font_01_sfnt_off0000d076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE888 16312 bytes
SHA-256: 4dbbc5167d2d1867edd0f46b0574048c6d1d41b0876f0afa38edfaf3870995b4

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