Malicious PDF — malware analysis report

Static analysis result for SHA-256 8916f9be31d66134…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 01:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8b7b00a91b2016844761d65b81b6854b SHA-1: 37630b29ab7c19c12d126e6a8a94b49710ccba1e SHA-256: 8916f9be31d66134c8c1aaabd4f045f326cc489ef0331a3e6153c27b49e23665
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the ML classification strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=stock+market+project+pdf PDF link annotation
    • https://dycmc.com/DATA/upload/files/202108210608236314.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/12461666223.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/eb1e439c52b16325bc7a0e4623dba016/22986829776.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/060652211a403e1e58e621947c213c3f/warozuwu.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/regodetunujisas.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/zobobaxesewesitesa.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/xinobubem.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/53071386916.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/86812999015.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d053d2894ef---sujixujijum.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210716090909985.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210626130752.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/2f09s2idv15s5grpas43gtd0v2/pixapifuzidiwapuwekowiwe.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/kipulakebarozob.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/59618995373.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/20407939088.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4098ebde38---73188435317.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf4c6465b0---sutimita.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/gifuniludusas.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/45fe0c3a30de183184bf346cc477b9f6/96938335848.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c3339dbe8---xesaf.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/e2b915a03ed895e139a0399ae928cf62/rositodu.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084bca9c295f---47193424290.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/3481358000.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/gp0dl1hf0plb59lmputourjnok/fadijuto.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_off0000db61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB61 10668 bytes
SHA-256: 7e21982a10517b8fc0ca214fdf0b5c74472ac9308d3bb78c443a090c1003a3ca
font_01_sfnt_off0000f3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E6 17836 bytes
SHA-256: 03c19bc851d2369013f399d3742aecf76cd375994346d767822968ffab0f6968
font_02_sfnt_off00012248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12248 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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