Malicious PDF — malware analysis report

Static analysis result for SHA-256 05613b6505d07821…

MALICIOUS

PDF

74.0 KB Created: 2021-08-20 15:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2bc74573d24347efd73bed0c55303fe7 SHA-1: 89b9dd6b7e7a9a3cdcf9a6ebc5086570795317fc SHA-256: 05613b6505d078216c2dc4a5e4e2968934ab6f9883c06be7098ff28a74283c9a
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection as 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites and other disposable hosting, likely intended to distribute phishing content or malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://weilaimachinery.com/userfiles/files/debafewopodi.pdf In PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/62016682212.pdfIn PDF document text
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/8201831647.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210630111941_459329682.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/gcl55qnlbudhksh6q4piq92j0h/vutijizojadojoziwom.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/niluxalelifebuduwipo.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/garojagagefiloluve.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d427bfe1a---93099782403.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f45542ad8f8---vakogikigutegumome.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/94411552453.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/walukujasodugewupulisax.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/nesodufozulowarimikunum.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/hgrk4oahlvg4qg2h0hjlk6b83f/refedasipikobetatox.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/36329654744.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///13762702489.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1609b985dad4a9---86427514199.pdfPDF link annotation
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/39421618434.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b20cac5bb23---lajikudarar.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf625bd7f41---komesok.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/jokegene.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/53c457f1e760fe653e98928fbaef3cc8/gomifaraxelalokojizekas.pdfIn PDF document text
    • https://ip-pharma.net/data/files/dirop.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/nezojonowig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=%C3%A7anak+okey+plus+hilesi+2019PDF 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_off0000bbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAA 17664 bytes
SHA-256: 2ac2c9b70528d70e5f6f07b13d453c61c8334652eb82f9dd7daece8055c2fcd4
font_01_sfnt_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 11024 bytes
SHA-256: 7b0d276873728e54e586b393ff4cd0f6f6e3302541d6953de13ece3024f9c691
font_02_sfnt_off000100d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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