Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7e71d14fae017d6…

MALICIOUS

PDF

103.4 KB Created: 2021-07-21 23:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8b4a27e9a89a58827a2f266f4c2739db SHA-1: 33c0b79c3eff2719b7c85fcc64490e41969119d1 SHA-256: f7e71d14fae017d625944917ac0e900ed215d2a8dd3b528200ecc4c5cbbf4e59
116 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier strongly indicates maliciousness, and the presence of link farms on disposable hosting suggests an attempt to manipulate search engine rankings or distribute malicious payloads. No scripts were extracted, but the overall structure points to a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • 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://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a1d0ab2ed---43513894889.pdf In PDF document text
    • https://cartolmania.it/file/47771729434.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/14129323359.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609917a004f9c---88241641016.pdfIn PDF document text
    • http://www.heksan.com.pl/file/98666552919.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/e21cb563e0ee2b7de733fd1d3c22cee5/papefepeno.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/nedovadepasutumarufutale.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/64dcadeef69d11da6ac179660739d333/gabegesurasidanujageton.pdfIn PDF document text
    • https://paperland.bg/uploads/file/jojanagowixaxodarewe.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/wenizakugutukuwosovumot.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160887102a63a9---wekapevesupufunidupawixa.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160db5c0013a21---pudatigukezebilewudab.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/mogerudivepa.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e7d3580b2---64510963030.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef92829e96---87674247134.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/mukalupisijiwetesiwixubij.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/88cbc9c1658aa66d19ccd36c56ca8883/fetesikap.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160788cacb5715---44785566938.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/09243c8f328ad460c97aca345842d2ba/zopavadepupuroribik.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/82549627651.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/afc50a47f2aacdf7e66f7c7e7ccb709b/gimiragexapinadavuxi.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f441446c---66242751637.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d97aa2a61aa---55216956934.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f0e19c531ffb730c1b7b55e66e7614a8/68448408152.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/13d21ac3b6697fb3f21ea5bea5997c42/83546122783.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a547efcbd02---faxalesubuf.pdfPDF link annotation
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=genesis+8+commentaryPDF 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_off00012f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F95 17536 bytes
SHA-256: 11ffa4b796be46ce0d4915e13c3736642c7e65f847b7c767d04921a2dd06a066
font_01_sfnt_off00015dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000175d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D1 10704 bytes
SHA-256: b9373b3aa71aa9c0c717f89ee131bf24c2e68fc1fff92d5b4d263d18bde2959f

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