Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c6d884d52049b2…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 13:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b6bcafef65f41bdc0250ab0bacbcb3f SHA-1: eeb610094534995e9f608739f4bfeb514c5570fe SHA-256: 88c6d884d52049b25d1a6db24e867b58962b8c9918445dd864ef0d71fe5760b9
164 Risk Score

Malware Insights

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

The sample is a PDF document containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs likely serve as landing pages for phishing attempts or to download further malicious payloads, as indicated by the ClamAV detection and ML classifier flagging.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://redigonda.it/userfiles/files/pikavuwukapenolagupipaso.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e6651ac5bd2---newedogitisikagi.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/90639758610.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b71be5aaed8---38732122127.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/fajexomuruluxilaz.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/mividokodoserozaroxuji.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/topuvikedu.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/budexinuwefa.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/1be66fa6969a2754f406924f4236ab63/vibufibiruponekegebesipaw.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/0olumsn5bcnd5urj99fn9p2uk0/zazezuxovusamidazakafuze.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/99972547562.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/95947291945.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2in36v7kk61duvdrtmuomgbifo/37629246137.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6363eca7a---3819283136.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbca2fadd6c---97457358607.pdfIn PDF document text
    • http://scheiden-maassluis.nl/uploads//file/33854049854.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/74241528881.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077acde9eab8---27075004156.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/06087725b699b6bd1b2a716e90d81610/62741157809.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d178677f6---61146567046.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/c221b89bf8696056898a4ee27dcecc08/50373947633.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/fatopomijudanopokigiwexuk.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/7797882465.pdfIn PDF document text
    • http://divyabodhanam.org/userfiles/file/79109430298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=timeline+toward+independence+for+the+philippines+worksheet+answersPDF 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_off0000c62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62C 11028 bytes
SHA-256: 173cf65ce3a937c03494352293c5fd02286a726ed3709d264cd8708e3f38ed86
font_01_sfnt_off0000dfb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 17880 bytes
SHA-256: 5da337dd6dc7b826c75b0102f3a0af7e46700319c1f5e323c905156ccd98581c

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