Malicious PDF — malware analysis report

Static analysis result for SHA-256 d547e1a779d310d1…

MALICIOUS

PDF

85.5 KB Created: 2021-09-23 14:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cf992e3a54669fab1da0fd459c94f3c0 SHA-1: 85b37adaa24079eaab5c0a09c71b394250a371b4 SHA-256: d547e1a779d310d1555d9b46ca1fef120eac5696cd381dbe8ece30d77eba3a92
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs social engineering tactics, specifically a 'Browser extension / update installation lure', to deceive users. It contains numerous links, many pointing to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://sutipatika.hu/userfiles/files/24639178429.pdf In PDF document text
    • http://buyo-g.net/userfiles/file/tuferunowe.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4cb9c9f18---79041363275.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161424b738b630---bekezakovo.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/pebib.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/95673674632.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/dibalate.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/74998929785.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614a067c044ca---nelarajaxidaviserukud.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/29629924348.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139e929dec87---30713548316.pdfIn PDF document text
    • https://pcetravel.com/files/file/wumedagigewu.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/gasazozekokisabadoravokit.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e1ae0e937---88240076827.pdfIn PDF document text
    • http://sjanzee.nl/file/kosepijoso.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/sisisazumisewiporomeled.pdfIn PDF document text
    • https://ebooksweb.net/files/file/679744002.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091612212373499.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/43681490622.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/xunigugavenopexirukesew.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/1068238250.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614139ed8cf59---jesaxobizujififilog.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/xajopetavitimuwome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+tv+chromecast+built+in+not+workingPDF 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_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBE 11284 bytes
SHA-256: c127e6b6dc15ae759f4541d5ea736602d3c86925fcb04868d7256c0a748e25fc
font_02_sfnt_off000119e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 18024 bytes
SHA-256: b9d75778ab9a653701fe72d8f9a9f313200c718c68459cd2e51ff030dd00abef

Open this report in the interactive analyzer, or submit your own file for analysis.