Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b406eee9bea8366…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 17:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55542d32c2c1b6eda8760dee94c12045 SHA-1: 0a5730f5c26ec12da1b6d01a37bcabd041d506ef SHA-256: 4b406eee9bea8366e64f4eb66e4f84baa71f1e89b7c7da611ff686509c8d99f1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a phishing or credential harvesting campaign. The presence of a link farm with UTM parameters further supports this, as it's a common technique to disguise malicious links and track user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://irlanc.ru/uplcv?utm_term=merseyrail+network+map+pdf PDF link annotation
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/febokoditepareb.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/voponusovujepitavuwulivo.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/97475201764.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5bdd84e2c3---nikewerasukoramitoro.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/tojefew.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612dff9aaa95f---kegemefeno.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/wemexetajowivuxenaduvovof.pdfIn PDF document text
    • https://rajaunited.com/contents/files/pobatejuregetaxetez.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/17128864163.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/42203176127.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/kusogezowapumuxuzame.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7515de4f0c---kuwevevorigijudijub.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/d96458b2a089284e1e5a689a14abb935/58614395622.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/23c6b3b4323b6be33179036964de5963/69330028546.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/maxifaxi.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/nuginekimiwebaba.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/62967532270.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/vopoxikep.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4d9a2a159---ponumorerakixedimobikitav.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/86669387420.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_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 10944 bytes
SHA-256: eaa97bd63a310fdffab6ca724886437587cf4b2277d61ad35e43866f02d4258f
font_01_sfnt_off0000fe11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 17796 bytes
SHA-256: c783aab08f0916ca11bc65a453cee36f02623da81b16625dfe4fcba08a73a2c6
font_02_sfnt_off00012b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.