Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c46c59096e49012…

MALICIOUS

PDF

78.6 KB Created: 2021-09-14 03:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ead66200e5e9744f8a8d6cd00d8c82be SHA-1: a6d3470fc450641a7209e81577498b8185ef5933 SHA-256: 9c46c59096e49012dadcaff410b2db9a9eb9fe93236a50c4978f5643a05fbb1f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://philabc.ru/uplcv?utm_term=toefl+synonyms+and+antonyms+pdf PDF link annotation
    • http://pushgroup.lv/userfiles/files/74432253119.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/wupifatuvililip.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/46722182244.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/bogirususulexe.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/67474741154.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/49892645238.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/topudajukekoxufasidilover.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/64074064226.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/6958343520.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/sajazulorol.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/699vbhp69hggq202v0j234qmk6/tenaxozozibidalevapur.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/59083935265.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/20470342891.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/movonosirudiji.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/36974860939.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/powudij.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210910_2ABDCE1D9553C490.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/zidigemuwovaba.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16135aeb9a8629---fevofeluripowatake.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/mujimo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613549b8c3dac---demivekevi.pdfIn PDF document text
    • http://nscenter.cn/upload/files/17017566747.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_off0000cc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 18560 bytes
SHA-256: ad75a39ea500939460189ba72269fc7b50c68ac5af5e4b9054b0376e71e99f40
font_02_sfnt_off0001144f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144F 10544 bytes
SHA-256: 2af01ce591d67107a531ef79ad902e19634d7224532844c708dd02d7dcca68bc

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