Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e2e2561c6a2396…

MALICIOUS

PDF

78.6 KB Created: 2021-09-19 00:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e75eb8177ca8056c3cb87d1758a8dd5 SHA-1: 44b50d2b285b03c6987946a561565b1ca81a1da2 SHA-256: a3e2e2561c6a2396356691a2889bd84a40a61b619279f14300a8943efb322a60
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://studiotecnicodama.it/userfiles/files/20850539663.pdf In PDF document text
    • http://tianfonmm.com/d/files/79991587129.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/64385991896.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/1299734678.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/wegasodokadotawogoxuwul.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/gozenaxidonixu.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613521b3603fb---46671146681.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/70023295292.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/35613250216.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/99638966964.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/62138328986.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/80257388643.pdfIn PDF document text
    • http://scantech3d.com/files/rivolex.pdfIn PDF document text
    • http://nktrading.qa/file/files/43562856394.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614655cfc7d54---1006182410.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/ee1d3a5673701ec3deb4244ac18e6133/kemovejufuzetuvevejoza.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/vorelefatogirej.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/pivizefizepipijulalozikon.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/lopofaxaguvedovawiwavum.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/91852884512.pdfIn PDF document text
    • http://waypl.pl/upload/File/jijivu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161335eb54510b---87638520582.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/jufidekubanivupojipim.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/kagipolegemawevoki.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/suzelozotudabamuvo.pdfIn PDF document text
    • http://medica-brno.com/files/71026255211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=adb+commands+tutorialPDF 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_off0000cf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7E 17340 bytes
SHA-256: bd4b147b7b4036959c1cbae00e53414afe79c81de83257f94d346a8008beba52
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 10620 bytes
SHA-256: 35872e3a60ca3581c7d441a27056e558a1b7df67b40a2e64bdd8ea7fa0066cc0
font_02_sfnt_off000114c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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