Malicious PDF — malware analysis report

Static analysis result for SHA-256 42688930c6eda6ca…

MALICIOUS

PDF

71.7 KB Created: 2021-09-17 19:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b77d3e106fe7115ab798a8ac60ce3406 SHA-1: 85590692c6315a0cf6d4ff79e323de48a116a2d9 SHA-256: 42688930c6eda6ca8a6083a892c740dec01639fffa86a8331b4290fd6f1eedd6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The file contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=how+to+remove+notification+in+chrome+android PDF link annotation
    • http://roomyab.ir/basefile/roomyabir/files/16019408147.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137de2d40106---12844001758.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/352a73a91fbec405a85fc7a94babc4ce/49389641499.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161412f0ba6f27---norofovedamudu.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/47457946617.pdfIn PDF document text
    • http://mutitar.com/user_img/files/36021513037.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/gosupevax.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/19344110834.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/10988378264.pdfIn PDF document text
    • http://boxethai38.com/upload/file/63638493989.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/zezafizolasef.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/10390161539.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/kurogowaf.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/mefezu.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/xunirididoka.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/61179092296.pdfIn PDF document text
    • http://fitviewer.de/files/file/8313884513.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/61214972662.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/f24128f905c243d5d5cec9d07876412b/wikokaniraru.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142ca1d1196d---dogumevisofatorewikobap.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/62228673329.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_off0000ba72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA72 10668 bytes
SHA-256: a875341aca431126ff1f97391a58f45d69e6e8b780e20fd14923175bda047ea8
font_01_sfnt_off0000d2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 15092 bytes
SHA-256: 6460dd723ec3769463352a8664683a608eb0318460dd75b7ff2b15039957f592