Malicious PDF — malware analysis report

Static analysis result for SHA-256 655aaeea73f8f170…

MALICIOUS

PDF

91.9 KB Created: 2021-09-06 10:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d3699f311db1bacd22b310cd74e7fc35 SHA-1: 988de9c734e69ddfd3269fed8a6a5da0bfdb89bc SHA-256: 655aaeea73f8f17009d708cb4f6df13e6b11d1ed762180013d7df1410602cb0f
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://wildpflanzen-planung.de/file/15709820082.pdf In PDF document text
    • http://exmar.it/foto_fck/file/guxukilajawuginasesemolo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/5227fd0068dbb9512f7e808ac51173d8/nedoforizak.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/raserawegudepijilor.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/473c22272ada12749ae240d2e8615183/jikugakigejiriruse.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2b49acae72f729847e37344bdb94a36b/sufeziwajobumutiful.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/pekagirivupunurugevajad.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/62681304608.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc239246e5---sotad.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/59824347561.pdfIn PDF document text
    • http://dzbnf.com/upload/file///pobiwekixarixefola.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608352cb7adbf---vajezivuz.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/pulek.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/rp6ml68dmcd0m5nqajoqomait1/duzibijasuwavojivuvigoxi.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608092dfa4914---34633762145.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ivtjdsvqo55f8rmtju1g9kjvpj/jogilifo.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/sodedarolifesesiwogagisi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0c3f7364a---buzepijisenedawokeweke.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/19637721405.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/29641614272.pdfIn PDF document text
    • https://seerupit.dk/assens/file/pupukexu.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/63265975425.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b0fbcc220---xepupevojaxiwux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=excel+macro+learning+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_off000102c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD7 10780 bytes
SHA-256: 33e0ace925e8500d83ff4f9630f85844f5802cbef225777de821ef48c164cdd2
font_02_sfnt_off0001335e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335E 18324 bytes
SHA-256: 152834095a144d2443d520b1c6fe36991e8bbc2be64d4118b1d1b2706f14f7dd