Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5977311853b8131…

MALICIOUS

PDF

81.8 KB Created: 2021-10-10 09:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 76ae31a50816f1ef6a214095924def36 SHA-1: 16a3b4c33edca716132f87c4ca09538b690b0da3 SHA-256: a5977311853b813158302e77f9bbc857b6816780fd70c512953b120f7101fa6b
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mastera-mix.ru/ckfinder/userfiles/files/likapugobefa.pdf In PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/xezibiwifurikala.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16148bb58b3574---84872736497.pdfIn PDF document text
    • https://paperland.bg/uploads/file/suxara.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/vonafafinipijexino.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/keriwujovixusovafu.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/wibopanorenokukax.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/70970396448.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/1nv8l85h5c2pa7m097rps8ddda/busegesawixupedilekalav.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615959f7890e2---2737961801.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/35632489064.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/xiwezekulukukagigene.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdef6a7ae---10505089326.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109120804394368.pdfIn PDF document text
    • https://austarpharma.com/upload/files/riposudo.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613133dfaed3e---51899622534.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/fafobunevuzuwezesu.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/96247827620.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20211001_9C25B43D8BE6101D.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/84986209918.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/47857314359.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/60363766165.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/60769284107.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/8614567369.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158e45cb6be6---fisukejakona.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/95861895409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=1.7+liters+equals+how+many+cupsPDF 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_off0000d86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86F 18208 bytes
SHA-256: 115e79de81ec15ed4b11bca4ea30d18e6ad27014808ba751358296b6ef70f9e0
font_01_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 11156 bytes
SHA-256: 4d2ce5ab7f59f1e191f0ea95710b9d232eba83ec0ece8688b8037945a204813a
font_02_sfnt_off000120f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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