Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5031ab8fee7c93b…

MALICIOUS

PDF

95.5 KB Created: 2021-09-05 16:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e63b8c2bf92b66b8d5189db5bb2f733a SHA-1: 6b35e7bb82348d0221b35c7aeb6e0f203ec8dabc SHA-256: b5031ab8fee7c93b9032ce5b87ec72b2ed837ce8dcc295a5388f1c82693d3134
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to link farms hosted on disposable domains or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://machi-tomo.xyz/js/ckfinder/userfiles/files/30677641586.pdf In PDF document text
    • http://iphysiology.ru/upload/bamifovu.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/sudajisoz.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/72851111436.pdfIn PDF document text
    • http://imaginove.eu/data/Files/37560789560.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/nivojufu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/e62b86g2setd27ugjomcrb2ai7/merovu.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/mijononosaxab.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/gowurevimogejaxifirur.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/74824474309.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/dabalakimukovozalob.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/84582571986.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/plnt7a4qfvpi9irvtg7357n4m7/finojikoxeterijujowel.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rimuxuwajotafaki.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f2a9998dd1afefed85da54c676c58536/rifikagojobuwo.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/69541850456.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/badipi.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/givuz.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/dobodukasuf.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/62101100647.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ceb0618c0---41481669328.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/lakamomafataluwu.pdfIn PDF document text
    • http://chamdure.com/DATA/files/vivit.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160725aa411e7a---voxinorono.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/8037995239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=molecular+orbital+diagram+worksheetPDF 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_off00010c32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C32 19508 bytes
SHA-256: b417447584dde4c45f1f596c8ac9dd4d1c93bb8ac52305aa319aeb1e823d4b0c
font_01_sfnt_off00013e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001569a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1569A 11124 bytes
SHA-256: 8ad942f1b3b9d62b6c11048a1d367b2e8fc48befe520323fcdcdaa06aa8c1189

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