Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e5a27346e9ee7b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-21 07:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be11c5e1d90bc6532c741fd5917d2a20 SHA-1: b15c01d921a3eedb4b1b1e288aeab80d3dd3345b SHA-256: 50e5a27346e9ee7b9a11460dc7035fd1c405b8aa9ef6021652a81490f287f8c4
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and disposable hosting, likely to distribute phishing content or malware. While no scripts were explicitly extracted, the nature of the URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest it is designed to lure users to malicious sites, potentially exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=how+to+know+if+your+mac+is+32+or+64+bit PDF link annotation
    • http://zjgyuanhong.com/v15/Upload/file/202196446285387.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/1gdehjjmpqmqf3bj0h9ns1e4u3/linuxa.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/suvomofudebixazujemusimi.pdfIn PDF document text
    • https://adci.vn/data/upload/file/xetifugomukinozal.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/67360757696.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/slmq0hqtlcdqcu0ubgpk2fboh2/luruzenajisugewan.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/82283916706.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/83440378972.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/esrlkrbbd4jr9oqu99cdj0277f/99821383446.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/30741591314.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/sobatovimoxixiv.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/fonukujatekafetav.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/cd3032d45a974476bb7caae1596ffca6/wudopudu.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/568bcdd388fbafb37486dc3acdf91d3b/24786935431.pdfIn PDF document text
    • http://surtek.biz/image/files/20150323_191954.pdfIn PDF document text
    • https://parc-hotel.info/file/99122981389.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/botukax.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/47544553677.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/zaluwepozenotaxudodotipa.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/53992523065.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/kuzesovuzobeguzagal.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16134075275294---40132534893.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/binikavidajoxipefusiluj.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_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 18000 bytes
SHA-256: 4540c005a43bd5007a68abaffe29a2bf7a175b825861be511c217d7a01496b35
font_02_sfnt_off00011edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDC 11380 bytes
SHA-256: a5e9773e6321366a35a45a12e6e20a57cad626d4abd21ac7c1dbd890638e64a2

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