Malicious PDF — malware analysis report

Static analysis result for SHA-256 4271ad591efb8ae4…

MALICIOUS

PDF

87.5 KB Created: 2021-09-02 10:31:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a9ffc3365ff24241ace84a095df62de SHA-1: 3327a99b2fc709280aa56b2b04bdf07038eaca86 SHA-256: 4271ad591efb8ae46e956d59fd976d284d6722126709ef813e94f7214ea849d8
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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://auto-spec.ca/fck/file/nijowuvarapaxuvot.pdf In PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a600a49ff53---porafipiduzetolulunisim.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/pj3mpmli96rd8h2vnboiese4u5/gadixezoxudugejuwugolud.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d67819b5523---faxesavazutevivanizaxilak.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/3348782176.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/fokorojezolik.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/kibegalipozadilazutenix.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/lilanepavabilowegusa.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/820bf15158e08b98474dfc42fa488f46/75539779723.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/burivilumopefubidumog.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/5372830089.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc1a3d0004---76342005443.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/kofenelizefamazite.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/27905839103.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaae9723e6---gidapabegotivu.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/xixoniniketike.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/49225701926.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a46550a05c3---66120998965.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c46351bb5---musuziviworabesud.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/14469015099.pdfIn PDF document text
    • https://csodamalom.hu/files/files/vubekeresitug.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771a4ad5129---87922148676.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/tubativudekawilegos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=shaun+of+the+dead+full+movie+download+480pPDF 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_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 11228 bytes
SHA-256: 8e07befd559bace46628ce6e7441a1ea1becd7e3918604f57031a30d6a70ff78
font_01_sfnt_off00010a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 17412 bytes
SHA-256: 7cb864380773535a51e58014cdef105b5a05faf4b90a0d6fce71aa709bba16e1

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