Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4fc096b7b823d96…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 22:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1b00d29a8b9e9bad37abb3474e9a1a42 SHA-1: bd4d70c30b0a94602c84a252a2ca3f9a2d13a795 SHA-256: b4fc096b7b823d9627e7196d560f69f510cb1021efc3e2aa15c9d4b00cc3ccf3
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier strongly indicates maliciousness, supported by numerous heuristics identifying the PDF as a link farm on compromised CMS uploads and disposable hosting. The presence of a 'download button' lure suggests an attempt to trick the user into downloading a secondary payload. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=online+change+pdf+to+word+document PDF link annotation
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/97052816766.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/mmme197o2ojv2lmgidbt0539ss/78151128164.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/98994139974.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/b0d3b13ffe0f559653aad8d5ba156ab6/25819750216.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/xukamesepotitolibur.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/lajukadomar.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/87913302398.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a7320ac7---repitatiwu.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/gixuguwiwamiwuwurunad.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/vebufekefimewumupagez.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/10b4fdc478e5f41b34f24bca85242371/zogagobozukejumemase.pdfIn PDF document text
    • https://music-group-store.com/upload/files/10657162465.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/380f06deb962a87dd34306feb5cf9463/30337336495.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/1n5v1i1m4s0ngbg3blbs35g7ou/40303213752.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210618135849.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb431dae459---67652237459.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/tesaxuxasex.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3c68a68b8975a5f9eafc437fd8e6abb6/reneriwop.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/37379536894.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/turifavol.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161128962c9604---xuzebajojalomip.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/dopiruxepatisogi.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/rfjr4cc6dct07mml5t4cv3thpl/92118028386.pdfIn PDF document text
    • http://tuzlakart.com/files/1361746952.pdfIn PDF document text
    • https://nhorizontours.com/userfiles/files/88258708663.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_off0000cda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA3 17500 bytes
SHA-256: d6c404360a2ff7c56ccd5b4f73fef97fe07303aabf6d38031b3aa2ac9a2d4ae9
font_01_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 11112 bytes
SHA-256: d18baefb955fce5b53ecea945cbbeb770e83621315c9686ac34dfdeee65e9a02
font_02_sfnt_off000114c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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