Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffc47ec4d2ba887…

MALICIOUS

PDF

86.4 KB Created: 2021-07-19 20:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f0d5d25d0548f45455bdc2dd66a8adc SHA-1: bf3627debbe97c6170b0f57c761663cb6a542d25 SHA-256: 5ffc47ec4d2ba887db73a6c604258ee1b6fe8526ce558c5c57f0bf5e3cc729ae
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF acts as a link farm, directing users to multiple compromised or disposable hosting sites. These links likely serve as a lure for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/ac3f1b4e08b10417afe4cbec91f02944/98256929915.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc1934d25f---zisowusipunuxofewoze.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/84304066815.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/89313340216.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/povinamoxefezifef.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/kiparavutisibomadeban.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/benubosuga.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853665d0aa2---63783548652.pdfIn PDF document text
    • https://aneri12.eu/res/file/12191163068.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/sazinafixipurikox.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/36447281986.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/88031704472.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/damimazevosozirad.pdfIn PDF document text
    • http://houselandia.ru/files/gogisopi.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/putinuvofevajivafegu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d2adb2b2200---japalijimaxugulaw.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/jepex.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/846d55ec657c651faa41884043a7d8ba/60252909426.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/7351415174.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/467be69adbf6cc4967be7634f11f973a/47778391838.pdfIn PDF document text
    • http://eventechsite.com/files/files/rikoxobiwazozuvupep.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/vuxogizotolam.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd02079438a---6596769493.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/55991101929.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+does+a+data+warehouse+differ+from+a+databasePDF 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_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 16604 bytes
SHA-256: 3317e3673e76a83b373f177e7a68c64897d905a37b831e407445f95d6c5cbb19
font_01_sfnt_off00011ae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 10784 bytes
SHA-256: 18109bafffc0d3a7e6296cb79c386c0c939fda2985a7bd00a24454ff6727cd6a
font_02_sfnt_off000133cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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