Malicious PDF — malware analysis report

Static analysis result for SHA-256 41f6e2e6515c3fc3…

MALICIOUS

PDF

95.9 KB Created: 2021-07-16 12:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd014636d3672f2cea317ec1852f3400 SHA-1: a2fbd5f44d8ab2b801d9825df6d67b508c4b2109 SHA-256: 41f6e2e6515c3fc317f887f424acd8662b0cb5ce24569082980e9d2666a00213
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/8632ee35d18aeccdbb3d5c6ca6773a4a/78962677434.pdf In PDF document text
    • http://giustizianuova.it/userfiles/file/9872599766.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a661208aae9---92952196395.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606d215ba4aeb---sapepofovigoz.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/susoxeropesaxagisumupano.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/vifito.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/29638623539.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/bdce37ac74b392e4d4eae43e8e9ee87f/83472859385.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/sivu90hb3clbcb47gjuetu123u/26581013662.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2bd4231dc0bbe642880276964638afe8/gitagusetipuxerazowoluv.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/1vefp9c7nfmh9vhoko3959undr/54405539560.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/kubenukumadurowivapaga.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/tugomoregosunalig.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a45b93e3db1---53819462052.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/jl62plnpitnpee1uv63d5l2rid/70021285119.pdfIn PDF document text
    • http://khacdautron.com/Images_upload/files/mufidoxuvuzabesi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a512lo46ari00ucdf290p685k3/fixuguzutokafa.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/848494e50e3677a9e74c70ba64bb51e5/kulivin.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/7anjoss1fgpqn3p31e9cjasqq2/zuluzirikuzu.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/wegiberedite.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/marigijisivakerijumu.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c449ee274ac---11839335515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=words+to+describe+flavour+of+foodPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001136c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136C 10664 bytes
SHA-256: e7d4003955c879cf558fb84d9b7b039b9dff0b8ecf18f7b5d6ff5679fba65e3c
font_01_sfnt_off00012c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14418 17812 bytes
SHA-256: 85f7653a888165e6e1507d1695c0db956b0046a26b5b241b161c591bca45e70d

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