Malicious PDF — malware analysis report

Static analysis result for SHA-256 e575921f9d1c4100…

MALICIOUS

PDF

81.1 KB Created: 2021-08-23 18:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1f049590b86bf178e91e22f598285915 SHA-1: 709f04a3e897fdf161d60d86866675d974a9916c SHA-256: e575921f9d1c4100f011226f175ef5a47ec87f3b1ecf2bb8d201ba18f2bcaff6
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The primary purpose appears to be directing users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=i+need+help+in+sign+language PDF link annotation
    • https://glycocalyx.nl/userfiles/image/file/19550184672.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d166fe5e9e---xarurexipesalubonon.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/4e866dd4e92471819e7a2b88d08d981c/70078076704.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/vd0m283n6951in09qth83u7vk0/20205286859.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3d3c43df---40152075315.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/bexebejuwewe.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/xugufesutizademixaxo.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/168ccd6901afcc4634c08ab9b96e2883/zipazivojena.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/kopetaw.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f8d21817ea97ab07e26efef4c9a2f8ce/wareja.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e71e5be7aa---gebovovexibivazetugosez.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/6a993787c8a128ec8c1de0506b853799/44063011932.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/13a6f0c72232be5051db98258ea9749c/54391336013.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160947391c1d84---forunepolinazezuwoz.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca9426b104---takazatimunejuwopu.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/b0c6j8a50olainc3rcr9uvgri2/jisubiginiravenif.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/lutujodobilese.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089c960206e4---88102644645.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/biukm9smfturi4afiaitasu8s6/gotejaladosinereseniw.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/sawadazumumotuju.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/26db3a444219c9c9785acb336db79676/12035464370.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/6282363165.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/7884060134.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/87051312980.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 10404 bytes
SHA-256: dd59b717ecc698f166f86ede621cf244500127e79353b0c4cecafd15ffecb753
font_01_sfnt_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 16556 bytes
SHA-256: 200ea26198b48ef155679284478833f2e00c333e83bdba74a4bc8db96543fa8d

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