Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed44464809548ed8…

MALICIOUS

PDF

87.9 KB Created: 2021-09-01 22:57:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cec16ec48ab453a6de5f9dca4f287f4e SHA-1: a182b1fa22d721d94f89beff62fbdebe1fda42cf SHA-256: ed44464809548ed8a1c07ffd5df2d4b6b231dbd6e1abbac497d7c06f7dd22230
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/dd1e6b8ae96d0bfcc0ff911a9a1bf3bc/wetetemimosipaxalumud.pdf In PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/32873535702.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2e503c734---65236755817.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/99759383520.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf408c072e---sisenolepatipu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1611461aa1f220---zuwibesapowerawatosotel.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/12902122037.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/xuturivotetexewure.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b878482f2c---xidijujebevo.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078b2110be0c---55475984184.pdfIn PDF document text
    • http://colescastle.com/clients/875019/File/9557471850.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f3c5c37c1---33575031524.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/99708241330.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf717a00bc---ketenafen.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/78439583439.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/43230677650.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/sexabosokosanesarenuk.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a2f88effa98a0cf9953b4297bed8f065/35063539684.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021072703122573499.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210718095249704.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/komodexuvanojoji.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/libopurimexuzotur.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/92435986641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+the+meaning+of+additive+inverse+in+mathsPDF 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_off0000ec02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 20432 bytes
SHA-256: fb3024a40a34d191992d7f93112cff45ce1eda93ff12da7054f71df96a5930b7
font_01_sfnt_off00012121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12121 10812 bytes
SHA-256: bedec1a87156074c533525edcc50dbfa8211efd6a7721b174584303a2f20a560
font_02_sfnt_off000139ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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