Malicious PDF — malware analysis report

Static analysis result for SHA-256 055b37fee5e6b653…

MALICIOUS

PDF

100.4 KB Created: 2021-08-02 14:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1307f103b895a52a36aea24ce3dfbbf2 SHA-1: 02b44c326ab8685b7ad06d228c2eb41b873e2411 SHA-256: 055b37fee5e6b65398670c72b341371b8ff48348bbb7a5191bb6bf4b92bb1033
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://altonika.pro/files/fck/file/27967392653.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/49674285695.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb3b9e8e06---4161221683.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/49391221854.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/79ace48cd5ddb63fbb4e77acdc681b30/temotafipaveseluxalunas.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/dubakonedafonamir.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/48324471649.pdfIn PDF document text
    • https://petikdaun.com/contents//files/xafonofekamo.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/4976529635.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928afeb540b---30773545679.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b082ce7de---vizoturinojizaviwob.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/34444980965.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/33831914049.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a171690c4---giginosaralagivetibi.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2gq8f6h1qc9flqvp6egqib365h/tusoliz.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/1b1179.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ebbe5dc42---xiridiramovuvu.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/panosi.pdfIn PDF document text
    • http://halaljones.com/uploads/files/14000378719.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/nenevomaluk.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/mifetokowitu.pdfIn PDF document text
    • http://dztechfin.com/upload/file///24835618777.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/36296262600.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/97577868120.pdfIn PDF document text
    • http://lawngo.net/fckfiles/wamunuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+fire+and+ice+mod+dragon+cavePDF 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_off00011f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F53 10664 bytes
SHA-256: 28114f02bd6be73ec78c756b164884a447bf7bde5ec4d9fd040d35c4420c7880
font_01_sfnt_off0001378e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378E 19308 bytes
SHA-256: d8c4225f8db20d9a4ba10dedaeb0d9c6390336a9c7f153e4e1dd665dc952a553
font_02_sfnt_off00016adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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