Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf6a748b9211263…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 13:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66964bfd3fc872f64e6579d60148ead1 SHA-1: ca96bf8eb3bcb00762a004b9c772dabfc1e48160 SHA-256: fdf6a748b9211263d51e41c619ca523ad91519389442fe1432c7fc1a3615c8d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting or compromised CMS upload directories, indicative of a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=afl+footy+fixture+2018+pdf PDF link annotation
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/75443575141.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/rogabifomezuli.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/d5d31532ce9025e632c7706cf0796189/varujogitupar.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c6715c52623---42244234445.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160777a4b09168---navadanapobo.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/lolejepalekefisivev.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608be01839421---27971783584.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/59899866447.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c881d1cac8f---48928842052.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0024d87e05---sujun.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/20981037339.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdc75b6c50---femesole.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/fdp34afc2t9acm64jon7ohcra4/70047260895.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e418d21edce---sajuxelema.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/mebigozavavalalotubibiweg.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/ca791e332d7add60326a0565a4188460/nodekorixokapafiwumafa.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21c881636---76852195003.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/lokamugowagowof.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/dalupiwofobivikolu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fbkafpeu078oo6mihaur907tut/91586566282.pdfIn PDF document text
    • http://dzbnf.com/upload/file///98843856455.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3656e85123---niwinutupu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086175e12500---73911202612.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9pbj3qdse3qh28vmiqckctcj9/joguzediwarijivixo.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/wezik.pdfIn PDF document text
    • 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_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 16924 bytes
SHA-256: 2b00833c76cbd7346f404de31b59b1e99a3e2bf7f75bdc19a408242903ce0c4f
font_01_sfnt_off000102c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C4 10856 bytes
SHA-256: 527e911c76e62860b06c3bc03bf25f172da6b5ae39c5294075fd22b3e8bfaf07
font_02_sfnt_off00011c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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