Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce817b9eddd68b91…

MALICIOUS

PDF

82.3 KB Created: 2021-09-10 14:07:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 370446abb87ed3d54ed6ab911b6a8ecb SHA-1: 1dd2acfb4dd2676098a246ba3cb88a62e7e3caf6 SHA-256: ce817b9eddd68b9146baa8d5022606d7c87b8bd4a165b46d17588a2b2373f538
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to provide a password for an archive, a common tactic to evade initial security scans. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the nature of the URLs and the heuristic suggest a phishing or malware distribution attempt.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://studioesflores.pl/obrazy/file/74929360603.pdf In PDF document text
    • http://schuetzenfest-hemeringen.de/ablage/userfiles/files/61907835923.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f72e5710ad---xusoxolotivomifubuzik.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/6b2cf39a4fcaf84a668c891c9e9080bd/xuxosa.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/45859769021.pdfIn PDF document text
    • http://princeverma.in/uploads/files/86521711283.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ceb3b996a1da734e77f363c3abf3f32b/sasunotagivuxuxusosalar.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19437464222.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021922114262217.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/desosegiwizuwokugutepigiz.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161366d8217d63---lawabilamu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313bfb22c6d---54210441162.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/zafatikejikizelule.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/27396345973.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/jafozoxixagewelewumax.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/rekeduximizize.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/04d6bb0db56b5131fab00ff46472ee05/23536659872.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/wodujog.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/todufinixenizu.pdfIn PDF document text
    • http://hydrem.ru/images/file/divibuzokomubij.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/zuzexoranu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ppsspp+apk+gta+5PDF 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_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 18044 bytes
SHA-256: 81df0f4b72bada69759c145f67c6932570d279c39ea076b902f15bad77e46435
font_01_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 10060 bytes
SHA-256: 54a5d209dc239347eacb7f968f0e9ebd3aa5fbb48b76ca011d026418ad3462f2
font_02_sfnt_off0001240a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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