Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9e67d08576eedc…

MALICIOUS

PDF

80.6 KB Created: 2021-08-07 05:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5391be36c47383b9236bc2c5b136321 SHA-1: 746eb6c18a34ab936a6d6bc3100a4cf07ccecfbc SHA-256: fa9e67d08576eedc888c4d3ece6b8da1223281012017416001addeee0e2f02f1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high density of links pointing to compromised WordPress sites, indicating an attempt to host and distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading malware via the link farm. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161013e3f2b83e---tefububovunetam.pdf In PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e302c1147---25353890899.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084849188cb7---pexejojes.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/duwotaxerarem.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f30f6e6e686---fikelimelakuxifetar.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3bbb826b---52453406292.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/1924790369.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/beganojoruf.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/dac869c4cb01362c736b09d349280aa5/81019668267.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ffe5de4e857---4072464847.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/gagitosemixefazupa.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/72199018938.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/bofejajuvozezajegitokak.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/67578335542.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b2a330976---4790509722.pdfPDF link annotation
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b1364119a7d---37753197892.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbff9af1c04---kututadeje.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/gozud.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/anj1am0b7ml2pse5rvccv3p8cd/luriwenazuseguxunexa.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/95123524895.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/49965733535.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/kitereralekipiwuxaboni.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/24132182473.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/11098106640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=kabir+singh+movie+online+hd+freePDF 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_off0000d718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD718 17092 bytes
SHA-256: c83ae7a72d24a464a4a48b87af992645e1230ce4a399576bd55eb7fb08bfdd34
font_01_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 10900 bytes
SHA-256: 202c5fd7bcb0fd939adaf8b65debc7dbece308e1b56847a39cd5b3a7a8e92b8e
font_02_sfnt_off00011c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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