Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa71f1db2bd22bc…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 05:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 285399bb752cba41b84b98fe404310d8 SHA-1: 30fe82bc43920e8b74089e7266fa6d548fd82bfc SHA-256: efa71f1db2bd22bc4f724b2b01295d7c54f289cd465db56f0e77f28525607d0a
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. It functions as a link farm, presenting numerous URLs that point to compromised websites or disposable hosting, likely to trick users into downloading further malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gorillatheory.com/admin/upload/file/81453021628.pdf In PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/piwateronopifobalefarex.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/70876844005.pdfIn PDF document text
    • https://fortworthdental.net/cmsCart/upload/file/68289093159.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/xarugaletapilefuwew.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/bef1fdcb64026390e87e308e3132417d/72497833223.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/9462773590.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/memafenevuvitakigo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16138e22f6d861---dogirupolizenet.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614120a3134c8---75239405742.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/85863373905.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109040715091403.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/33698034019.pdfIn PDF document text
    • https://equinox-e.com/upload/files/zabisix.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/19109227814.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6b22d7c54556e05db7bf4f6add060b9e/luwitibitepakixutepiwama.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/39635753496.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/kemuxupeg.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/23171598242.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613478ce520c4---83005988688.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/gijur.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/nafekamomulawenadoporut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gta+iso+file+for+ppsspp+download+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_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 10616 bytes
SHA-256: 4d6fb007d2a5e8dd8757280fbb3c63d6031cff64671c89d2b910b1d636db5cf6
font_01_sfnt_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 17336 bytes
SHA-256: 4f2852f1d96fa354e245a79c37f9a1c0366c0108811fb4981242b0cdd3ddde7b

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