Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a47f7e75c58665…

MALICIOUS

PDF

76.3 KB Created: 2021-09-02 10:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a17df3704c5f602e87419e2ff79b1c2 SHA-1: 7d5845e906de27dc141e60be777e96da4d42b534 SHA-256: c3a47f7e75c58665f1985b4adf3c53705aad792cbf0cc045007f4c4474531b1c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as a distribution mechanism for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://medvor.ru/uplcv?utm_term=entitled+to+your+opinion+meaning PDF link annotation
    • https://dm288.rs/slicice/file/39218910596.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/532442653581299bf14b876c6b52d760/27077933500.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be5132175dd---65113951313.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/85492217697.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/cnq8bbtnfqq3ql69ero40f01g3/64678225260.pdfIn PDF document text
    • http://marketingnews.fr/images/file/6268822676.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/096a8140f8b2894fde9f895d78fa10fc/78509565231.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160947db067b4a---39904865434.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/sadodakesomexitogowazopej.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f1014fa2c5f0f012bc9ecfa26d0f70a5/tobotazivemigiziwajuz.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210809222447.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/89321281375.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/xewozamikesesita.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/56390816527.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ee906b46370---filojogapolavosunomovuli.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/29538655008.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/pofubemodox.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/68718722058.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcdba90c80---68692738467.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a03bd8426---38430375872.pdfIn PDF document text
    • https://quangcaoxetaxi.vn/upload/fck/file/sevij.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/vafegetarawisur.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210628_105657.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/lefawaj.pdfIn PDF document text
    • https://coil.hk/upload/files/24566510050.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_off0000c606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC606 10764 bytes
SHA-256: ce01b3220b451d292ae0eadf2e370deee2f10612d8adc71950d4f965f122d16b
font_01_sfnt_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF698 17372 bytes
SHA-256: e5e8c21923966202b4a7ecbf08619416683a0b1ee3551742874ee8bca3ba5602

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