Malicious PDF — malware analysis report

Static analysis result for SHA-256 0da401dbf71dba94…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 11:44:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 39336d5a370491ed3cff09ce939f6f9a SHA-1: 37e902051eca23c1bef7327bbf66a827330162a9 SHA-256: 0da401dbf71dba941d4e06261b672108c2e072bf4fa341dfb40f0e8600478404
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a link farm pointing to compromised websites, with one URL specifically hosted on a compromised WordPress upload directory. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of numerous unknown URLs and a specific compromised upload link are the primary indicators of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a0841ae23b7e100f53b47ff04a74b71e/debogifogonaxukikip.pdf In PDF document text
    • http://nsdadventist.org/FCKData/file/sitewomorebo.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/vulopimujut.pdfIn PDF document text
    • http://normel.org/files/upload/file/95104092597.pdfIn PDF document text
    • https://gppacdatabase.net/userfiles/file/sojojifibor.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/83459129832.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/70181869730.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630508471.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/nusesir.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/11790393570.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/tuxovakomiminigezovob.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/disigavugekak.pdfIn PDF document text
    • http://solentpodiatry.com/jackvl940/web/content/images_uploaded/file/zipojoruvudazatotuketak.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/jevavituz.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/fifafokomegot.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8a21639ccc9fb94271a6033d17e619ba/ludatifuzevirafowa.pdfIn PDF document text
    • http://evola.it/userfiles/files/nimivaki.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/54372258701.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/97724180825.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/mamelavedalixewulevet.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/kokop.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/tatikazi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16141d5f10089b---fojuvenaxofudibixejaru.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210914104455107.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/9047479612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=monster+legends+hack+androidPDF 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_off0000ca71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA71 17496 bytes
SHA-256: 43c114f99c57a58006e9aa799c1361ffca7e5f6bda9999f13026401b3db4c9fc
font_01_sfnt_off0000f773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF773 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8A 10732 bytes
SHA-256: 5f32231ee1b2ed675a4c116b7279a79c316684147181c001c195974848c03b68

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