Malicious PDF — malware analysis report

Static analysis result for SHA-256 15aed520dedaea3d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-19 16:10:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c15a5e156f7791c8ba667963e916c70 SHA-1: 006a9ada4721bfa5e554742455886cde846bc4ca SHA-256: 15aed520dedaea3d57ad33fe6c363416997bc8f766a2490825234220cec2f332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS upload storage. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://basyapiemlak.com/yukleme_klasoru/userfiles/file/fuguje.pdf In PDF document text
    • https://samajsutra.com/userfiles/files/dubod.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/jukiturawudoputimelepode.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210909120458.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/jutob.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/gojit.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/25428983679.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210908015015.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/11020650657.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/mamef.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/divaxosemo.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/fetuxasutiluponumadedame.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/molavijupa.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/zijasukovogijalaw.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7e1880ae---99003961955.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/tirutalogekibijuxasuvunor.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/jobudokunobowavopuzog.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50cb3b77d---sezez.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/82001862694.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/bojidowewizumorimomavi.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/12618206084.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/b1e3283e2c04060fb58918df01ba94bc/ninokowo.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210905_871050657C605CDF.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/bofabajidagiladubilagut.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/58044586174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+store+data+locallyPDF 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_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 10456 bytes
SHA-256: 0047c21a2bfc0830cb554fd2b973b6cfc3bc66496d0b7084c64438f06f0c49a9
font_02_sfnt_off00011253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11253 18272 bytes
SHA-256: bab6b147ee5877a7c26060309b8a66cfab4ea6abf37e57b4b8a99d1d4f0708a0

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