Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ea805cfab33504…

MALICIOUS

PDF

81.2 KB Created: 2021-09-10 00:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fc705ebde08a265940c722809bffa34c SHA-1: 227641eecf2a3e31a321f798c5ba49ff63aa8cb8 SHA-256: 82ea805cfab335046dca4a4be33bf0318030eae2f1b123f17c1dd096bba8addc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to disposable hosting or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 http://ohappy.org/userData/board/file/4466448842.pdf In PDF document text
    • https://keyseries.us/userfiles/file/94947916713.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/41955126804.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/jixodunegog.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/64844610307.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee4e680de---pifesumaladuw.pdfIn PDF document text
    • http://mlsy.cz/images/file/files/rinoseruxak.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/nesubunevazeruj.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/89023675533.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3f6ea35b---90765476833.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/sabute.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/gumadunutixuveluxexumite.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/watimezisodovitazovawozil.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/wigepar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bed4bba17---sotubifuparigaboren.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/81609625245.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/17986341673.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/webokivubomijojawetakivup.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/vutamuruku.pdfIn PDF document text
    • https://costarica4d.com/contents/files/pajinirakadijazuxetixota.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/70063627976.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/funurawebeki.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/wegazefaxatababutobite.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/42890869160.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=attributes+starting+with+oPDF 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_off0000daf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 16672 bytes
SHA-256: e2d141076f26b023861b9a277a46402d3a47b203df4dc0ed13e9e0da7987a2f5
font_02_sfnt_off00011e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E7C 10648 bytes
SHA-256: 655812f2ee0a2850bae902346eeae648f8a6ab4f8d25db834b8e65a0c482e769

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