Malicious PDF — malware analysis report

Static analysis result for SHA-256 39020235bc368ba8…

MALICIOUS

PDF

68.9 KB Created: 2021-10-02 15:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 68211bb0fe87a19479a67b0b130618fb SHA-1: 440f7adece54862a9493e2aaa2e16034850c8a96 SHA-256: 39020235bc368ba866111c141ff0cc07b6245507c55934dbd4ca54d631f71b7a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains a large number of embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://qianlong99.org/ckfinder/userfiles/files/modorimari.pdf In PDF document text
    • http://tlw.ro/UserFiles/file/mojejojupepu.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/bofaxijivaxazusikufa.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/desekalivas.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/gimubudalunojamij.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff744856cc---49667732168.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/45282389678.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/balufutojarukarafi.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/69963873916.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/fa9tuvt1nn0d7cjia8gf7upmjp/mumetit.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b44ae285f9d899c77e8908ca51cafa7f/rikekisaketumuxix.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/bifodamanajotu.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/48756466292.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/86233246853.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/laburojuvujaguzabeveg.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210903_7ABDA00D177D234B.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155a49c5493b---65665758416.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/sumisakeperejirosaregag.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/xudefipawilujo.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/60354162469.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/barusiwegozo.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/9301586919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=aspergers+and+stutteringPDF link annotation
    • 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_off0000afca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCA 15136 bytes
SHA-256: 861adc803737b0afdd4c5cf1f0b712f81b4aad9f8559b6e3904170925fd6beef
font_01_sfnt_off0000d632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD632 10484 bytes
SHA-256: 049ee485d3ac59a2310c6b330034fe19876830f492c1f2cfa397b2d883d1918f
font_02_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1