Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a4cf28dce297d5…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 23:25:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2ea2233089c77d186aa2318dc122446 SHA-1: 013c62aeb87421d67ad6f36e91a546b65db61f7a SHA-256: d8a4cf28dce297d5e610db255e13da3e242ccf2e186ab7931650428899348ac5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=lulubox+apk+carrom+pool+aim+hack+download PDF link annotation
    • https://yuanfuconstruction.com/ckfinder/upload/files/29960054885.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/tazasofizun.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/rarilemupu.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/65822204455.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ad8f8fff2d6282f76ec8a1da4dbfd5f6/rifabuwozofebuxogemaf.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613635cc29186---kukik.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/datakofapujofonoteju.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/tabesitiwaferofegenosituw.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gigapupulabufos.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/33515655908.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/fobozosagitabo.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/nupesonozidanif.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/tubokafodefikofelixarap.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/87793987612.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-10/20210910083004988796.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/bemefavowuwarigugamego.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/46451034561.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/murejolatib.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/8728447593.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/31963749766.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca5be368a---dunasodotetegixavowiteb.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/juromuridelotejurol.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/5t4qjss313snqvoesvoobhiplg/zukanamipimonese.pdfIn PDF document text
    • 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_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 20144 bytes
SHA-256: 6bf775d9474ea3a30ae0b4b227c5ab1dd470bd3f57af1d330469b013fd6fefff
font_01_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F4 10856 bytes
SHA-256: 6945bfc2080a4d70f7a0691648f8af95cc7cdbfd899cbb21e56a1ac9927b23de

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