Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7fb7a2a30dc29b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-01 06:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5ff7cb6593cb0ef3c8fde60e9a118eb5 SHA-1: 00fad2155a0cf0e8168ac7cc445833d782cef0b3 SHA-256: 3a7fb7a2a30dc29b44d9ad5dbe4cf8805f142dc9dc97e61d9a660722827f260e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://crysiq.ru/uplcv?utm_term=paper+template+goodnotes PDF link annotation
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/9c81c61e11b05dd6f37b1c42c95c6e04/sukanujer.pdfIn PDF document text
    • http://ximangsongthao.com.vn/app/webroot/uploads/files/dukene.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/58353310717.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/c56debc04501169987076af2682d760b/tabozezojiwomili.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/69145438295.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d94e354aa20---zofetakakezutalunewiv.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/6b1e162a46f1bfdf9a7dc31f2f5d9968/tepefo.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/sitefebufuzedewumanogam.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2273d06fe---6336084626.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/kewalidotuvilewaluweg.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/1copn138vjugbkf570r5dhhv1d/84559358481.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/detagoxorenosukewap.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/busaxekikixaso.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/29b738phbuvi0p9de93n78cg98/58810149926.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/pikun.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/400527cf9393d99d31460d2af79ea16f/raroximodafubamop.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705023eecac---mufiremoxukepezupapu.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210829194300_ebrg2i.pdfIn PDF document text
    • https://medtek.vn/storage/file/fonirekukidado.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/30516433097.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/powojudilegez.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834025ecb4c---6153205173.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/zevilorubetibupetune.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/lokuzadimojawukarawo.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/c992bba030481409fa33fc23dadcffce/11382054734.pdfIn PDF document text
    • 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_off0000e2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DC 17892 bytes
SHA-256: d5c68dec4f936d866cb0c91ff794a2614eebfcdb17e6f58a449e1cc071aafa26
font_01_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 10644 bytes
SHA-256: 0c314481cd78f77c8155aee901df040a138a65b3bc2ea9734d27596fc56a6f5d
font_02_sfnt_off0001293d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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