Malicious PDF — malware analysis report

Static analysis result for SHA-256 41413a0ae536b02f…

MALICIOUS

PDF

78.2 KB Created: 2021-09-09 02:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b43f8c4d1b809effc52b2f135374f2b0 SHA-1: 3e653169fe0615347196be94ec53c98458e66a3c SHA-256: 41413a0ae536b02fe8dc12fffa862878b159963b8e6ad5a4b5ed9031a45aacde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to link farms on disposable hosting. One heuristic specifically flags a link farm pointing to compromised WordPress upload storage. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://bhsbeacon.com/FCKeditor/file/zemerigelejagigenajuvol.pdf In PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/letodoxugidukezozogo.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/10525025139.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/88590042184.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/rugibaxofosirowidusin.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/fiximejitutososijejisefi.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/26523874740.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/81778528763.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/wuxusuxexa.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333aabc229d---2922291991.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/76712735740.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/25572233413.pdfIn PDF document text
    • https://777mto.com/contents/files/solonuzefiveze.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7f51cfa62---96809005323.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139269803c19---24490636330.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/nugoxixosagib.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/97731698762.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/56557742063.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/boxiguri.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/zujujag.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/xutuw.pdfIn PDF document text
    • http://tabletopad.com/images/file/75828168393.pdfIn PDF document text
    • https://aokman-drive.com/d/files/66303673916.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109041705191798.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/wevukefuduzomixuvedom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+clash+of+clans+hack+version+unlimited+everythingPDF 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_off0000cb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3A 17296 bytes
SHA-256: 5452bf8eac0a6c0a9f41f4dcc49ad6c0773e90a6b41bb60d3aad652e6398fd2e
font_01_sfnt_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 11380 bytes
SHA-256: 1e867dcac8da93dbac02df4100cf21786c625813f560c24645444d43b50fd44e

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