Malicious PDF — malware analysis report

Static analysis result for SHA-256 549530dff03ad00c…

MALICIOUS

PDF

91.7 KB Created: 2021-09-04 02:47:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7146b2f5f1ead7c918efd86e9e23ffc6 SHA-1: b8ee6b2add9753dc66575c6f6ceafcdca9c71c1a SHA-256: 549530dff03ad00c202b01f6ab43930a132bbf2e7c9b97b13ca2c99ae506cb6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure itself appears to be a link farm, designed to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/ibh7b1iirka0cv22rqhs3eoe9d/kasamone.pdf In PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/xulodilabazagirexu.pdfIn PDF document text
    • http://heureka-cz.eu/files/wadijo.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/87529908273.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/75105001250.pdfIn PDF document text
    • https://buka.ru/sadm_files/vudavuxoxinabopilekibabe.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/mixumupulegetolulujawarox.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/8c64e7de445e7b60d8d87a15b0f96520/jopuxamisaralataxo.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/rarabazejeledenanusi.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d3eece4f3---49694025527.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/xazunomogogavi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4972d5c2a2289ebeeabf3fc163f450d4/janubifokulevodagade.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/90224214014.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e420bbaf38---dafilefebofi.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/wipopunomovutibodogov.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/cb983a52ff561040448e791b9164f54e/fowetulazerujisajakusu.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/luramo.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/51283767336.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/83829347281.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/kodebijapeledalufosizal.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16114b71034af9---76707145796.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bba72cc02---vupujorulowigapip.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/21713129638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=brts+map+pdfPDF 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_off00010540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10540 10216 bytes
SHA-256: bb563fe4a81a2bde94a72723db759a4192aa0a71cbad41378b49a6fb7dda71d5
font_01_sfnt_off00011c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001344b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344B 17340 bytes
SHA-256: 884da9b0d80f2b87b49ce54e6989b0e5b5a5945353a10d9a7b010aa95bc954a5

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