Malicious PDF — malware analysis report

Static analysis result for SHA-256 7395a40b5a559c8e…

MALICIOUS

PDF

86.6 KB Created: 2021-07-01 17:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a7875a76427970c43e12d21348a40c9 SHA-1: 6f42a9154ad1157b61f5c2e437cf114916e8e558 SHA-256: 7395a40b5a559c8eda795aa009a19419d0301304779eb9f74437adc7832dfba4
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious content or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • 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://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6eb816b30a76837f254849342e6ec641/vewukokapojinisuxilorew.pdf
    • http://gourmethousemacau.com/UploadFilesfile///93355355817.pdf
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/70382688704.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606c7a667aa4b---kidikovidigununiseveforul.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d073b9bf33e---15942396464.pdf
    • http://hnkingdee.cn/Files/file/202152422349.pdf
    • http://bike-aholic.com/UserFiles/file/67144466700.pdf
    • http://busankid.com/webfiles/board/file///48087902601.pdf
    • http://sakem.org/userfiles/files/fobosenefofipipad.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9a57a1f75---20975669737.pdf
    • https://autoradiator.mn/uploads/ckfinder/files/90146196552.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cff447947---xisikesexofowizu.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe061bf7977d99b09f1ba285f34d6186/71519126421.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7b77b240---kufonerumagivideninaguk.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/h9vghccl4809l1uavn71ve284g/6887941263.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080285fc8faa---kizewoxatojulovo.pdf
    • http://mtecommerce.it/public/news/file/satakifepezizabiki.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2107011739535295807tv2d0.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d614176aa7---lewasuluzumizexonidug.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/8vkmjl10j4mlcc831ho43vnff4/wovotodaritibevam.pdf
    • https://ntpuvoice.com/ckfinder/userfiles/files/wifopowoxebum.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/4b5560b53517089da4a575b01f753ebf/forajuzotexedexinetejor.pdf
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/5e4d2540b21daf7d3217e1103a0655c9/visaranajedolig.pdf
    • https://abeess.com/userfiles/file/90393521098.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad961d31247---86778420208.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d3a4af2c7da74486fb206f6136986749/38085783370.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=poster+and+pamphlet
    • 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_off0000e738.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE738 16792 bytes
font_01_sfnt_off0000ff4a.bin
d93072c36a87e24f97167a5ae144a25b5e43528a40fde8ad0ed8cd1f21404b27		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4A 21376 bytes
font_02_sfnt_off00013582.bin
42072ffbcfe7006eb932a052f42ace84a08c43a12ae050a5102de24a9b125c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13582 10564 bytes

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