Malicious PDF — malware analysis report

Static analysis result for SHA-256 3623c35b82fd475d…

MALICIOUS

PDF

84.0 KB Created: 2021-08-19 13:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e7a9a8ff447d45755b3ca269704718f4 SHA-1: c41c960c3e85002c6f5614eef17a901707667353 SHA-256: 3623c35b82fd475d1ba507720d253b33264ff2fe976d77f7dbd73f793b9b3b2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://gbagencement.fr/uploads/file/49850249966.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/sfgom157srrh0g4a137fhvt620/90971631427.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/6957574116.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/xowavofokonetorajapap.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/dubepu.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nepugidipubemirinud.pdfIn PDF document text
    • https://etadelloro.it/images/file/vemoberaxovejanujusabili.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/09dbi5slj410nmhooa5tj2svg5/lowakevitirefope.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///58883894869.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607231b360e86---56117484390.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/79791633651.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/baqoquhdlbahch25742ab1a4k5/savutiwejili.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/70a226e4b37a3bef9f7582edc6996d03/51119753350.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/31092442608.pdfIn PDF document text
    • http://turbooto.vn/upload/files/36296553095.pdfIn PDF document text
    • http://megalaserasia.com/upload///13596521129.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/70297752965.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/ziwupabiromemepevor.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/8220297234.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/vl8bh624bhqgoo5h2vb89q2v52/mabusubuxumivulorovuxen.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/manunanu.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/dizimokowesedaratikega.pdfIn PDF document text
    • https://ebooksweb.net/files/file/10257880214.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/podole.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/mijegigexijuxatini.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/53715622586.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/d454388bfcfec6f0f09aa221c92c8bf9/kanonugatajemusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=smart+notebook+16.2PDF 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_off0000e1f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F7 18524 bytes
SHA-256: e105033fd5e49cf6a81be14b1d5707141fad695da9de4e9cacd86f1be1f4eb15
font_01_sfnt_off00011147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11147 10676 bytes
SHA-256: d766725ec304c4338ae838839e3b9c457c9b61b0d69c7613b196819c86c073de
font_02_sfnt_off000129de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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