Malicious PDF — malware analysis report

Static analysis result for SHA-256 da522334fa977fe9…

MALICIOUS

PDF

89.4 KB Created: 2021-06-27 02:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2a5e35b49e1a6ce57d9b8588571d8852 SHA-1: e72a271807d737435e4eea2bc19dc3e636a0b30d SHA-256: da522334fa977fe97f18cccdac43fa94c80160620e0cec1c450bee1945875301
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/02b12a230ec8b1037221c3f46ad69dc8/lasevurosekanuzuvofisali.pdf
    • https://chaplains-camps.org/upload_picture/file/34725802801.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/71543199777.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/a5dr96a7fidabhou5hfouruk4n/ramukuxatadijuwoxifadana.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/memewizim.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/25317ba585ee184bf5209a1ce7c6d3b7/vetusezizexala.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abab32290fe---96348130284.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/98b172973643e1465e479d76d348e08f/60966615970.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4174aa3046---sisuroxozunobexuf.pdf
    • http://luingpyrex.cz/foto/Image/file/35867978068.pdf
    • http://softwarefactory.nl/images/file/8128292320.pdf
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf95c9c83---98451976689.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4c6c2a25c---16334889396.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ftldum4o6unvorbtpj7dglt9n/77415505952.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/kikorixotivobositagozuda.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e0865162a0e532f3b986517281a3e1cc/lutatikaxaluralipowoz.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3d89bf0f101c412a7f9290256756e21a/84679855815.pdf
    • http://kledingindex.nl/images/uploads/99532374782.pdf
    • http://hitecds.com/userfiles/file/74069121843.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f32cfac086---59456864942.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=unerupted+tooth+difficult+to+remove
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a7.bin
de4dca8290d13a592c3f167e09e45ef43604003f07de8de4cc8ee60cfd11f716
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A7 10728 bytes
font_01_sfnt_off00011008.bin
3a2a6b36bceec84de92592654abbbe5ee8d3be6dc47ecbd747aacb8928ab6f1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11008 17668 bytes
font_02_sfnt_off00013ead.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAD 16792 bytes