Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98c776edb9d061d…

MALICIOUS

PDF

85.7 KB Created: 2021-08-15 07:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5af6c7d67dd96568c2f0a7880c87204b SHA-1: 078916721cf759c398e0260b01769a18e43b65a9 SHA-256: f98c776edb9d061dd5e379ff7cbbca93ab23596a6a8d3a5ff684c34b4301d1a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions. The presence of numerous external URIs pointing to compromised WordPress sites and disposable hosting, identified as a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095adf540581---mogonipuvezomapi.pdf In PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/b928b493cc4f61a23532a713ba5e8295/14980178128.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/giruki.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/67225483238.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/23355329641.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f42513fc66---27037595688.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/zazosixagiwikibekaluxi.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/63995d279027291276ffceac5136314b/42318339188.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210619174541.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c8154ac9fed491af24f5a702bfcb7e5a/gumojiwefekisewidokiv.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4ngirlcso28djo9nf5877fvaks/niwikolinomafulatolajomo.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/kegoxuletipugusu.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/29026498329.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/95717671943.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nefozutevarunuw.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/xilozadatisop.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/vf5qs7gj7k3cd0ff34vucbdvl9/pigamewoz.pdfIn PDF document text
    • http://qctc.vn/upload/files/lugudi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f27507053---89176343540.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16070e51708e85---posidonolirudasaxedaze.pdfIn PDF document text
    • https://shidoremicrosys.com/media/tezenif.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/85267397508.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/gitodiwatufulofipesot.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b16da2c30---78448518558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+lagu+malaysia+sonia+full+album+mp3PDF 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_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 16636 bytes
SHA-256: f4bf20e70a5a83ce054a9ea42882cbce53ba3b200206cae989ac19989551c282
font_01_sfnt_off000114a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB9 11124 bytes
SHA-256: f2eb32cfaca06359942209829ded6e16314f023c5e556fbfd6685262df8a884c