Malicious PDF — malware analysis report

Static analysis result for SHA-256 a061f677b863d1e4…

MALICIOUS

PDF

134.2 KB Created: 2021-06-28 04:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4221237f7a4a5a6fc31e33bfca633c55 SHA-1: 2f1a2b5a8c8fba83cfc979bf0c9293789f47dbc9 SHA-256: a061f677b863d1e4d4a2820d2f2ebfda9548a8c5b6cea90335226635fac7ec6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to compromised websites or disposable hosting, likely intended to redirect users to phishing sites or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://all-stage-meditation.tw/uploads/files/60cf7b29ebdfa.pdf In PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/rorobatok.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607815bb03a1a---5238032075.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01e5f7504e---lirafisafokowipeviz.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ec9bff9085755dbe84a36ea2df9d3c07/14862876792.pdfIn PDF document text
    • http://metallpress.ru/files/xamonet.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb000e3171---42935329259.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/zofutodivowu.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ln5enprpel7ackq5vooe7knd2l/63000301012.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/a99779de2e03fa6a4cc6924671da9c09/62653962428.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///retajujasadiwu.pdfIn PDF document text
    • http://sun-eko.eu/files/file/biduwodowiwegasebez.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/51287264673.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/wikiterowarasopevemumi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/d655747c3bae97c4883e941837d0ba89/worogajixoniwerugos.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/fidafuvamatuxav.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/9537cd55c0186bcd700155111c5e4044/70553911464.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160710d74b669c---27207632086.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f77a4a5dd---woxenif.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb07cfb2d8f604140c0ddc80e144989d/titiwimajawafekexuzod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=believing+your+own+liesPDF 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_off0001ad18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD18 17404 bytes
SHA-256: 91837c1efbaa2e054e8e554de23a87aec870d130861a6a4393a588cf2df5c021
font_01_sfnt_off0001da27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DA27 10440 bytes
SHA-256: f13eca871d1d45111825453bdf90187bf9c6798cee8da9599e7dd4956ebc2cd1
font_02_sfnt_off0001f206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.