Malicious PDF — malware analysis report

Static analysis result for SHA-256 39b64654c3163672…

MALICIOUS

PDF

72.7 KB Created: 2021-09-16 17:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc99357765d13ca368f799484a13fd4e SHA-1: ad750b4c436e0cae2a5357cbe5a0b7722c7ad201 SHA-256: 39b64654c31636729636d32cec2f5f483f011bc38c7871a06df2d03eda76ba19
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. These links are designed to appear as a link farm, likely to trick users into downloading further malicious content or visiting phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=need+for+speed+payback+obb+download+for+android PDF link annotation
    • https://ristovski.mk/public_html/upload/userfiles/file/65624637509.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161433c3c3f7bb---36632699012.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/wuverin.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/fujonuputudi.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/potatagokavigupemikape.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/58412110560.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/29139767095.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161376df70a151---situvuxaxa.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/dagimiz.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/bikemilo.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/kubarewuniwopanati.pdfIn PDF document text
    • http://homeopathyhk.com/files/fosubotigofiloguw.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/81263361735.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/19743875557.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/pebududeb.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/56411083496.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/bodevojaxoruwusurovoj.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/rixobepaki.pdfIn PDF document text
    • http://toyotaprius-custom.com/js/upload/files/92581139158.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161380149b7dd8---70163834194.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/68027104994.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/47931556599.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25790910005.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/lqrb9nt6r3sn5p70c01qe2j106/wobiwaxojisivebexuzole.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/161346db0e50bc---41512027564.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_off0000ba27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA27 16200 bytes
SHA-256: 638c9a8f1efcbb363367a4dc8c8c35eb19ba952855c14ce196d6ebd89eee0fa0
font_01_sfnt_off0000e3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 10924 bytes
SHA-256: 726507764abdfaad6e896e85a823999ffdee281d19b47368633198e377d2d461
font_02_sfnt_off0000fceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1