Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd527e2e70feb8c…

MALICIOUS

PDF

83.0 KB Created: 2021-07-07 13:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d6fb6c30a631f2b2f0f14f37a2e5c16a SHA-1: de8e6753de96926342b4e3d327db443f1a2dd1ec SHA-256: 5cd527e2e70feb8cdecc9deb7542c9404d4e0f6a9472671c8988c2a97ff8973b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=delayed+toilet+tank+fill PDF link annotation
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a72d743e59a---48248172774.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/46501963447.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df6e84cf25d---94053106021.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/93990362201.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/58126259486.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ada16e4485c---jejozunabur.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed4f8126e8---27961724408.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/sevetumejipadu.pdfIn PDF document text
    • https://service-panev.com/userfiles/lerixof.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kunenu.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/cfd620e4b4e40b8d634b38bf995f2e6c/wajoxosigul.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/61410665334.pdfIn PDF document text
    • https://citytrafik.nu/images/file/tunivurudomalurobu.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/28621491513.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/xivuwilovi.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/17057629821.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e26fcfee3489ba2c97d6f97e3c53f920/19030821022.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/71590769744.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/xesexexitevuxupu.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/36668046125.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751e1e7e19a---2482916687.pdfIn PDF document text
    • http://maxbrio.kr/files/files/lixituxibotokaduxakopovi.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/42937816903.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_off0000e384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE384 16328 bytes
SHA-256: e10296b24ce3e467c203d46709798d4ae21cbd5a52c0a61055dcc8981eaaa849
font_01_sfnt_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 10288 bytes
SHA-256: 1361472db7ec1cb5ff0429aeb423673a4cd70783a88465d4d39e6748e87eca11

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