Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f2768b6d8d1829…

MALICIOUS

PDF

91.1 KB Created: 2021-09-17 17:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a3c88fa620d9e58f0cc50d0944e7837 SHA-1: b0113e8acd7f31627c52dd709f5def3af04548b4 SHA-256: 08f2768b6d8d18299474f68dba7817b1daf2ab1f91472227fa3d12c38b559725
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 https://indiantalentjunction.com/milan/media/29656784251.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jilavilagisufexef.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/48073b3a9b1966296d54bc83377ea8d7/xufebiwijudupopeso.pdf
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/panunejep.pdf
    • https://berbagiangka.com/contents/files/dadexufimonusenaxunigero.pdf
    • https://esperidiaogomes.com/userfiles/files/fekefofaxiserem.pdf
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/vusogutabaludosukufakemod.pdf
    • http://aviatechinform.ru/sadm_files/kadidogamufid.pdf
    • https://global-product.org/CKEdit/upload/files/38308484459.pdf
    • http://dynamicyunnan.com/ckfinder/userfiles/files/9720325938.pdf
    • http://stigstudiotecnico.it/userfiles/files/25421973988.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/b8j9fp52elfbmd4rjs6kvtirvb/devaro.pdf
    • https://dermatologie-francophone.com/userfiles/file/87571130333.pdf
    • http://sarkanyhajo.hu/files/file/vitoxevulex.pdf
    • http://e-hematologica.com/users/file/75795805146.pdf
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/kefopevigelofolez.pdf
    • https://samirkumarpaul.com/ckfinder/userfiles/files/namexaburadekuwovirud.pdf
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/mizefujok.pdf
    • https://alshamiltrading.com/alshamilfiles/file/jijidolal.pdf
    • https://laurallo.com/ckfinder/userfiles/files/kalabivonisevolepu.pdf
    • https://valerart.com/ckfinder/userfiles/files/dasekeg.pdf
    • http://air-ned.com/uploads/files/zezesarirogabusofokug.pdf
    • https://sluganarodu.org/userfiles/files/69479112646.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a3b3681c08e93089bcdc0dbee01e0aec/95064985342.pdf
    • http://dansecyr.ca/pdf/file/89726525798.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+i+get+rid+of+unwanted+ads+on+my+phone
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df57.bin
94c8b2b608882732b7deac337c424bbf4312c2c643bdad98c1a1a3d7713a9800
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 18588 bytes
font_01_sfnt_off00010fed.bin
b9a935c3f5621eb4b16c7b6e0faa1db59474e267a7d2265c70abbf93c1245d4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FED 18000 bytes
font_02_sfnt_off00012bc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC8 16792 bytes
font_03_sfnt_off000143df.bin
253426b0b84fbf261f7463b9d0c3d3d10da9e6b37f05b5d5e4add4cb3aa8d1c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x143DF 11192 bytes