Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d8b6313085c7a1…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 19:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49e3f20b65ebfa09cd7784393a5e6b7f SHA-1: 7867d51baa36637a3c48d42c641707155aa5406e SHA-256: 88d8b6313085c7a161267f5df38f5f12cddbda6f17f6a63f4b96f354183568b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ateliergermain.org/sites/default/files/file/faxevugugavow.pdf
    • http://sql110.com/pic/wuzigisileduwerixob.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/99b74gc2u4feaut9ud2af2brl9/69314786110.pdf
    • https://sydneystudytour.com/accounting/userfiles/file/55122481612.pdf
    • https://abctranslink.com/ckfinder/userfiles/files/tumilupupofopuzo.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/6905rm13arknqlngibn089m0ir/91944096115.pdf
    • http://nationalcoopadvisors.com/userfiles/files/86425789262.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/jigukafu.pdf
    • http://vietnam-intraco.com/webroot/img/files/66848732018.pdf
    • http://hanasushichoice.com/uploads/files/kopulogifazubo.pdf
    • https://somogyplusz.hu/files/rakisurusixudi.pdf
    • http://bluebossa.pl/files/file/47156023812.pdf
    • http://eapver.com/upload/ckimg/files/202109140509131114.pdf
    • http://chatyzvule.cz/uploads/rubuzulefegusexefif.pdf
    • https://nslogisticservice.com/userfiles/files/97601637761.pdf
    • http://abwvictory.com/uploads/files/94291961351.pdf
    • http://digitalpolicycouncil.org/imagenes/file/vopevebinoxovogawisefi.pdf
    • https://mysilo.com/upload/ckfinder/files/47368127890.pdf
    • https://iphastkala.com/userfiles/file/36656992053.pdf
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/bajilekalozufuwewuxigas.pdf
    • https://jakspravnenapsa.cz/userfiles/file/23168533691.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161367b2d06f34---difudowojutomolesoroso.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359684195bc---texifozupogug.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/48031961533.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffe970a513---94338106740.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+secret+in+their+eyes+free+online+streaming
    • 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_off0000e44f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 16792 bytes
font_01_sfnt_off0000fc66.bin
639572b5461a330cc73812d11f85093ac7ad9d98e73c3a0ba78e0bafb509c2fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC66 10860 bytes
font_02_sfnt_off00011559.bin
71e9e564edffd7f2cf2de199c30f20d7b4123602f773211c2ba181e076845033
pdf-font-stream PDF embedded font (sfnt) at offset 0x11559 17424 bytes