Malicious PDF — malware analysis report

Static analysis result for SHA-256 5828076e25b84516…

MALICIOUS

PDF

74.4 KB Created: 2021-09-25 10:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 01d54a5bb7d312d5aa86d692f5dd5f7d SHA-1: e062e92eeb5265b091bbaa579c1b6b389be64a75 SHA-256: 5828076e25b8451643be560933d2ca308b3ee399dfe595cd881450157153226f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or redirection scheme. The presence of URLs like 'philabc.ru/uplcv?utm_term=redmi+4a+software+download' indicates a lure to download software, likely to trick users into downloading malware or phishing for credentials. No scripts were extracted, but the overall structure and URL patterns point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 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=redmi+4a+software+download PDF link annotation
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93f78b91e---83722001176.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/juzuzefaxajisiz.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/nezazovokivabemago.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/60352865831.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc83fa379b---4586250939.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/vurunexebujigileb.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d44bc4e1a---70500049285.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0b02f9f26dcd842cc99d169cd8d2f3c2/jijakazogo.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/mavasilonurinuvawemunad.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/taxogakuniv.pdfIn PDF document text
    • https://adium.ru/userfiles/file/53419783131.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/54478142736.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/sixawefemodopulenavagane.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/xosupolitom.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/muzinesuwobavuvuw.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/xubupavotogajifemik.pdfIn PDF document text
    • http://kalikraft.com/images/file/dinigotoxutikonuf.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/94733636672.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/95837495804.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/niwewi.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/xifonemeror.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/tewajuzuxafakareke.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/40285079310.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/28639508037.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_off0000b846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB846 19464 bytes
SHA-256: 6f8762be486f9255d6bc79ec95fcae614d0b42c077e99e773e539bee185abf5c
font_01_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001030b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030B 10724 bytes
SHA-256: d53f2fc943d05fca18cb8f09f5e86d267d49338be680991f370cdd890ad40e53

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