Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6daa60804f1bc73…

MALICIOUS

PDF

84.9 KB Created: 2021-06-25 17:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 53675033b02b01eafcbaa76c9c7912e4 SHA-1: 39f5baebc6fbcc5174b858db939244e7ba0f18b6 SHA-256: f6daa60804f1bc73430a44106d1cbfdd79da9ee29f220438661f4415708017bb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, specifically within the 'formcraft' and 'super-forms' plugin directories, suggesting a link farm designed to host or redirect to malicious content. While no scripts were directly extracted, the nature of the links and the heuristic firings indicate a probable attempt to lure users to external malicious resources, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160765fd1b9c4a---bakixina.pdf In PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9922b6a2e6---fibagojulokitovakefav.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/64593899276.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/49869622020.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/1369a91e543af8f7869ba296f3999462/rawenupukifipuvuk.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/v66p9j3ajagk8i5b00foo1ike7/45191430473.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607ddfb592644---86793786392.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab98c20537b---27226837909.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/6c87698f2f3db72871d145fb108e08e9/82560276848.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b43caf2c3bc---88872847884.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f0b23370ee41ff9ec43f8b9d14ab171a/55139415479.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9b8f07787549b42426c0344989956190/girotu.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/nidufusabexonogonez.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/3279190862.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/9132291214.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084467a0af6e---xekafokel.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/355c0ebba8616817629a0fc1431b9c56/savazujen.pdfIn PDF document text
    • http://kleiberit.ru/files/file/nuxetev.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/367410154c86b092c77031694673ac47/27911781980.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/bapiwujugugedosakaxulo.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/1342648443.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/tozagivirunevekikexo.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/21732938642.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608493240f73b---tegasizisolijowopuweri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=beginning+android+games+bookPDF 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_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 16204 bytes
SHA-256: 9598dfc8ba066e03f49a0614afc859a06837e332527993c69c17c91d6a2114ee
font_02_sfnt_off00012dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFB 10732 bytes
SHA-256: 0a30c6d3469ed4a9809a357e885c77bb0aaf03e6ae45fb0084e0409df345e350