Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9880e08ddb6194b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-07 09:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe5d78f4061db432a967f5e6ac99ff3f SHA-1: c134192adf7b60d70a33540eaa45a9ba48f11efb SHA-256: b9880e08ddb6194b60249cc0ef9eace7d900e13f57c3e916616f18170edf2fdb
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://oniceh.ru/uplcv?utm_term=estimating+large+numbers+worksheets PDF link annotation
    • http://musorcentrum.hu/files/article/file/kidexotefokobi.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/85816175745.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae9ff66f29---dabisezewemataterutano.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a44161b8ec8---furig.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/npgrfoanl62l25j288gn7d38kl/linijezoxesoxijiv.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/67864321126.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/zinazudinuxup.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/gifivobenufosidazuzi.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/44dd76e155988365b7a9e168c59108c7/lapafamemedogaxo.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021080217003773499.pdfIn PDF document text
    • http://mimpishio1.com/contents//files/80148725542.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/37794719229.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/firovase.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/70228910852.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/bagetemovak.pdfIn PDF document text
    • https://pixel.bg/img/file/67014320936.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/fegogupigokisiwusawowubo.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2190f1d2a---mevusisatifiju.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/15121622165.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a926386770adcf01f30fb8511d03a2e9/pazikutuso.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/gv3v6alhsi40817eca7q4a5c1o/joxadumumelanoror.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dbff64cddd0---pazumapodaxigi.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0348fb2b5b---91638666408.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_off0000b258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB258 10956 bytes
SHA-256: 4f9950839b8865def4046ff5df91fec7284925421436840755356ba3b62c9ab2
font_01_sfnt_off0000cb94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB94 14380 bytes
SHA-256: d0c9655b154f27aa240db30ee83794d641c1188f36bde7f1094e3435b8fc011d
font_02_sfnt_off0000efb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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