Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b713c6d504afc3…

MALICIOUS

PDF

95.7 KB Created: 2021-09-10 03:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89ccb086e8c3e1f3420397bf9286423e SHA-1: dc6ae924cc320c8c8d3b5c985e76294e9a2045ed SHA-256: e1b713c6d504afc3d57bd51e8e7eb4c14ee5861ba163418ce5478f2284232cd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this, as these are often abused for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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 http://amuseonline.com/absite/userfiles/file/24765499572.pdf
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/fokatejuj.pdf
    • https://habibitours.org/ckfinder/userfiles/files/37886771373.pdf
    • http://bjdfszwy.com/filespath/files/20210903175847.pdf
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/ronutojekufopediz.pdf
    • http://duquenne-moteurs.fr/webroot/upload/files/nofaxisomev.pdf
    • https://100tmt.com/uploadimage/files/20210910084442.pdf
    • https://hnhaa.com/userfiles/tnejp/files/luzevoxixit.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613548a62926b---92829714616.pdf
    • http://thegioimercedes.com/upload/files/4025601284.pdf
    • http://centrlita.ru/archive/image/file/89353862206.pdf
    • http://bajajsports.com/userfiles/file/57851415783.pdf
    • http://meditopthailand.com/file/89376120185.pdf
    • https://premiersuli.hu/files/files/55240820488.pdf
    • http://asckhn.com/acskhn/userfiles/file/75659544402.pdf
    • http://okvin.org/userfiles/file/xezitubupuj.pdf
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/77846999451.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0af8b2a91---romatopekununaxopid.pdf
    • http://planet-for-events.de/userfiles/file/juwexozobodokumiridakexod.pdf
    • https://pachetedeturism.ro/images/files/29108641035.pdf
    • https://behagi.eus/files/galeria/files/wunojupulanas.pdf
    • http://wo-kop.pl/userfiles/file/81587740304.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135759b7e5dc---ludaselijek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=super+mario+64+file+download
    • 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_off0001119c.bin
5d8b97323a668d9c8428e44ed81611ddb9e8ad69b2c661453394e617778a9d10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1119C 10900 bytes
font_01_sfnt_off00012ae0.bin
2b3ca4326a55bb96be54e385748635f41366681e5c7851cee0e48f7c16ce18f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE0 17968 bytes
font_02_sfnt_off000158e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x158E1 16792 bytes

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