Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58bd0d93ce0fdd4…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 20:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 15d651c635e9e264013e5ba2622aecc7 SHA-1: 62f1d4e5684eae6aeb853662f406912e57e44212 SHA-256: f58bd0d93ce0fdd4d2c358e29d40c90743a17a2265abb0f6cc52047e0abfe4ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to potentially compromised websites hosting other PDF files. This suggests a phishing or malware distribution campaign, likely using the embedded JavaScript to facilitate the download or execution of further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fier-forjat-valimet.ro/ckfinder/userfiles/files/regimonurobupiraf.pdf In PDF document text
    • http://stringquartet.biz/web/images/fck/file/fazililek.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/88230619987.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5023a2dd09---69115562207.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607403c65e353---rekipesukasawufusit.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8920535f7---lanobusixanufezebozuxabi.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202172270583723.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612c0d680f119---75841602928.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/ff70863b5bbcdbb50a01f49af048ba8f/womujinorobunusifojepa.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/45126684448.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///66459297696.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a1400710fca6b29090d6c0436b465b0b/dinujudalobur.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/56281723399.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/f6747d7274b33bb2227b8bd00d85764f/wopotejonazisolelo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0dc1d58fee---fesijifixuma.pdfIn PDF document text
    • http://gibeaufamily.com/clients/870383/File/rejevagilax.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/27199311759.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/tutenebodob.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/31nnnv0hgmbrdkr0gu136aaqfq/kiruzimaxilijefobopixix.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/wutulolepojasevuko.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/77399804006.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/0tsnnbbhlh96pbbbosvvgvk0fg/41516118865.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/3829807777.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210725213620_1895487903.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/16810219186.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/37471001765.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+share+screen+on+discord+ipadPDF 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_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 10644 bytes
SHA-256: 1f1f75f960dfae2bea3edd1a54dea8d34e8a54d4ea76ff8c3275f0cf802b2e5b
font_01_sfnt_off0000fec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC6 17196 bytes
SHA-256: df5959c962a68d4c3be5f186ec36ea3caebdc73c8f253498dfc6136121774a63
font_02_sfnt_off00012b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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