Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff01f4a9cf632a9…

MALICIOUS

PDF

80.3 KB Created: 2021-09-10 01:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43929100e69ad3645d4fae9195792efc SHA-1: 2d3f0f60760d574fd6066a44db4b93d4e1dc7636 SHA-256: eff01f4a9cf632a9dae5380ca10b58928db81c3937a64d47294393d47978130d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple embedded URLs that form a link farm, directing users to various domains, some of which are associated with compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these redirects. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.anjhimayath.com/upload/file/86670321818.pdf In PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135759b7e5dc---ludaselijek.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/retotulajuseralutuda.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/22198077262.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/baf9353a9bbb16c9d7fb33bedac546ed/82797368527.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/34066351305.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/pixole.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/44232363140.pdfIn PDF document text
    • https://badrivishal.com/media/26470807458.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/31500158483.pdfIn PDF document text
    • http://dkind.net/userData/board/file/39680511730.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/45062571481.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/pafibej.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/bekajoronetiron.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/82330499723.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/kuzujesalopoz.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/2957925572.pdfIn PDF document text
    • https://jungleflightchiangmai.jungle-flight.com/Uploads/files/47809479235.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e2316c9a7fc713977463ebf498d4d254/figaravivo.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/41359575813.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/12698389554.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/38481731236.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/79803312261.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/xujifuvelubel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=worksheet+on+present+continuous+tense+for+class+2PDF 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_off0000d25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25C 17984 bytes
SHA-256: 1f584afa4a11b673b20f82ada0a4e1b40db073a45933f4952860125258c7c613
font_01_sfnt_off00010067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001187e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187E 10880 bytes
SHA-256: 6398514e87ce411dee95657b604f897ffbd8550b30a5d5c88e250b2bf031dca3