Malicious PDF — malware analysis report

Static analysis result for SHA-256 4652ef9ac8e8ccb5…

MALICIOUS

PDF

85.8 KB Created: 2021-09-05 16:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9b5ba1a74270715ec7d79d3090f2b9e8 SHA-1: 9f5785bc55aa5017b17bb3282d80f5305ffc9625 SHA-256: 4652ef9ac8e8ccb51e3e2ff43f9ce135b30e1f91f1e89f781972e169994bfe0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://krisoc.ru/uplcv?utm_term=mcq+on+cryptography+and+network+security+with+answers+pdf PDF link annotation
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/i36e3g479cs95v9abcgmkbukb7/jukitafagakulorakitolapi.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/16279030042.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2c7c4a4e9---75193742797.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/xozulutike.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202106282038304138.pdfIn PDF document text
    • http://apothepharma.com/upload/files/gomowikameba.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/parovevimumaxikulemoze.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/76644fa31daa5fb678d36343a96f04f1/48272986487.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7dbb74a241789933cd19970a9ed2f8c4/54907804842.pdfIn PDF document text
    • http://findplusltd.com/file/jofurafajivudokoriguto.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ce5a9d23810---39070881382.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a826d3cc95---10909638216.pdfIn PDF document text
    • http://splogservice.ru/content/file/zelozidof.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/kexewatunob.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e16b5b5ff---sasozuwaferopirogolaporax.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/26831550241.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/6944626831.pdfIn PDF document text
    • https://andrejc.si/files/file/5377809388.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/ridadabilikitedajivafod.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/97087280855.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/2953097424.pdfIn PDF document text
    • https://stauber.lt/images/files/femuruxukuxivarabagi.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/60ef5eeeae7f1c80cc008dc96e13f023/zodopalafarozi.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/3ec47c45a158006d2d0316d4c85cc23e/42791610536.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/3f5c84ee3ab304851e178899a6cc09d3/zedoxugi.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/xitebuzoz.pdfIn PDF document text
    • 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_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 11384 bytes
SHA-256: f81102091325701d156aaee2a909628402f1f017b5c5653e943fe85ba49466e3
font_02_sfnt_off00011931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11931 18288 bytes
SHA-256: e2b419e52f1307ad2f6cb6e94b6346f6c6870bb6e1061f9cea93a8e68671e41c

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