Malicious PDF — malware analysis report

Static analysis result for SHA-256 05bc1d03e534b5a6…

MALICIOUS

PDF

89.3 KB Created: 2021-09-02 08:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3593527315dd294ada4d3fd8f80eecd2 SHA-1: 9668613b0aad24a5fe1c5999d14cb334d93851ca SHA-256: 05bc1d03e534b5a6e13f516ebd37881dcc1d75f115e1a2023782d52c4c0a48ef
116 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The presence of numerous external URIs and a link farm structure suggests the primary purpose is to redirect users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=relationship+synastry+free PDF link annotation
    • http://pengyou-english.com/FileData/ckfinder/files/20210831_D689BA59CF962599.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/u5f31rkjhmokh2vkqn6beg9e94/29999763814.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d3adf2bf6---51799352281.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/midaforewafadixowozos.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/lovuxol.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/47207323710.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/26399693339.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/85187dd1d8213b5150ad57c0078b7839/46397187809.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/dufimekozapideratixo.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/14631402732.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccda8ef59b---nepezodoruzuzul.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4747eee4a856bcb228b7a1b003212ed2/tukijemesazekosu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f07375a7d5---muretubetupodiri.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/movot.pdfIn PDF document text
    • http://auapp.ch/userfiles/files/39451644863.pdfIn PDF document text
    • http://krugernilssonreunion.org/clients/c/c3/c301050bdfa85653d7453904791897ac/File/86514535486.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/sadidob.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110fc4d46ca0---golafovub.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/36369074725.pdfPDF link annotation
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7fc4a1c61---wotunegejawipudirodej.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/wizoluwolupefiwud.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fbc3eb7e81rr2v8fujjt76gj48/xifasoped.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_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 10616 bytes
SHA-256: 36cb4d13994d8b84693b070066d51a89c51ee829e4429dc493cad089d6115c87
font_01_sfnt_off00010d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001256d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256D 19772 bytes
SHA-256: 19f5c9c1daad933bd73200113dfb030fd4267e80195dfcf408d77c1190639724

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