Malicious PDF — malware analysis report

Static analysis result for SHA-256 669f22a4dc10cf3c…

MALICIOUS

PDF

86.1 KB Created: 2021-06-29 20:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 03d292cd6fb5f45a43f3aa9de74c44fe SHA-1: d18cc8db969a5976b70d0573593c4eccbf25389a SHA-256: 669f22a4dc10cf3c347185726a22da841a6a63c2154be722e1942db870c3ca5f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links reinforces the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f33a14b710b09d7a09d1eaff3aae8caa/kopuduva.pdf In PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160ad02b1c00a1---dokexaluwikitajixot.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/35867347765.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/dfe0c7e9a05370edca80e084616f8f11/12162091472.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/62522086350.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/76533582711.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad857dca138---jusosobesamepeb.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b46efd06150---31329866087.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/78a51d7a26625286954a152100edb445/valisude.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6c4b2f291d0fcc03a696cc375c7709f1/bamopuwevidukotiwalos.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160afbe8abeeff---24596657335.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a712456e180---bitig.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861e07362fa---5601573446.pdfIn PDF document text
    • https://masihpt1.com/contents//files/resusewufiteloxebiluti.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/d61786af01f048fdd3b270a7d77786ab/25288562945.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210629050153.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/78809252304.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/1180114928.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/refuwoborozototijojefo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0f6a9367b4790dbf7b7fb68296452aaf/tibumodexiwijijiwezog.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943d6e58f13---lukaluwarigajop.pdfIn PDF document text
    • http://www.celso.org/download/lekemajaxefevujinisidow.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/35410737366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pagination+on+websitePDF 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_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 19544 bytes
SHA-256: 1e315869b5ef0af5e36f94dbf806bb906c31e90bde7cb68c9731ad7c42b30177
font_01_sfnt_off00011bde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDE 10364 bytes
SHA-256: c2e23632dbc2e1d7742483cd7f63bb2b7c005089828205047d7efbce402bf75d
font_02_sfnt_off00013384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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