Malicious PDF — malware analysis report

Static analysis result for SHA-256 8203d7e7d683e888…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 23:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a84499d584bb26f9b7b6284437c7ddfa SHA-1: 06e661132f918476a5d47a28489e832a5ff83be8 SHA-256: 8203d7e7d683e8886d02913c652b5fecd3221670ff709f6ede2accee7401f530
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and redirects users to multiple external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to download further malicious content or phish for credentials. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, a tool often used to create PDF versions of web pages, further supporting the phishing lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://civicwomen.com/ckfiles/files/72475996263.pdf In PDF document text
    • http://koddous.com/userfiles/file/10704180735.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/dulovavate.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-19/20210919111200586342.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457adde3a1c---suxuvokemofixe.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/30553157794.pdfIn PDF document text
    • https://longhoang.vn/upload/files/41422397653.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/2012125643.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/migijirokubixemoru.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396a797e9db---fejatugokumujiwabi.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/venoginejet.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/55489117507.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/30823499079.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/rejibogeposojenefa.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/kuwidukuwogedubikup.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/23024710452.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/44649685261.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/66933102911.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/11143691121.pdfIn PDF document text
    • http://bingsu.ir/cache/fck_files/file/pikirazajapovadukenewojol.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b1220b9a0---66373618326.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/lanolizopimoremujura.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/kopufefejidironumuvi.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/35032692542.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/nunejekofebowolile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+hunger+games+catching+fire+torrent+downloadPDF 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_off0000b33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4D 14176 bytes
SHA-256: 82f8f1f3d10577868d0e1a7ca4c2972d972280e941745295bcdafd9a0a26d549
font_02_sfnt_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 11072 bytes
SHA-256: a67354a3f6e60a4adf75f7d4d7bfbf1a6b99d59c967fa0a0661f3b667d2b7ae7

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